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Air Blowers In wastewater treatment processes, aeration introduces air into a liquid, providing an aerobic environment for microbial degradation of organic matter. The purpose of aeration is two-fold. ​ To supply the required oxygen to the micro-organisms Provide mixing so the micro-organisms come into intimate contact with the dissolved and suspended organic matter. The most common aeration system is Submerged Aeration. This is where air is introduced by diffusers submerged in the wastewater. Various types of aeration blower systems are available, the two most common methods incorporated into small to medium sized aeration systems are piston and diaphragm aerators. Both units have advantages and disadvantages when applied to the wastewater process. At Austin Bluewater we are able to offer recommendations on both types of product for your particular requirements. Looking for technical information? Go to resources Want to know more? Contact our team today! 0800 287 846 sales@austinbluewater.co.nz

Built to last Tank Manufacturing Process You can trust in our tanks for their strength, durability and our meticulous production process. Each tank is constructed with a single piece design to prevent breakages and leaks within the internal walls. Using specially designed steel moulds ensures consistency in our production. After every pour, our moulds are carefully inspected, cleaned and prepared for the next use. ​ To reinforce the concrete, we use 665 steel mesh and extra reinforcement for the lifting points. This internal mesh is centrally positioned to add strength to the structure and meets the requirements of AS/NZS1546.1:2008, ensuring a minimum concrete cover over reinforcement. Although more labour intensive, this ensures a more durable structure than commonly used fibre concrete. Readymix concrete is poured into the moulds and externally vibrated to ensure all voids are filled and excess air is removed. Once cured, the concrete in our tanks has a strength of 45mpa, twice the strength of a house foundation! After the pour is complete, the moulds are covered and steamed overnight for optimal curing. Once the concrete is cured, the moulds are rotated, unclamped and lifted off the tank. Our skilled team assembles the required quality components and completes the internal fit out of the system. We pour the tank lids separately, these are placed on top of the tank bodies and sealed along the joins. A bead of sealant is applied prior to an epoxy mix to minimise the chance of leaking as much as possible. Before being sent to their new homes, each completed system undergoes a thorough Quality Assurance process. Want to know more? Contact our team today! 0800 287 846 sales@austinbluewater.co.nz

Resources Here you will find all brochures, warranty documents, user manuals, care guides, installation instructions, system dimensions, technical documents etc. ​ If you have any questions or can't find what you're looking for please do get in touch with us. Brochures Click on the brochures below to view, or download as a pdf. Advanced Wastewater Treatment System Brochure ABS2000 Primary Septic Treatment System Brochure B52 Taylex Lightweight Polyethylene Treatment System Brochure Oil & Grit Interceptor Brochure Warranty Document, User Manuals & Care Information Click on the documents below to view, or download as a pdf. Austin Bluewater Standard Warranty Aerated Wastewater Treatment Systems ABS2000 / ABS2500 / ABS3000 Owner Operator Manual Septic Treatment Systems B33 / B52 / B90 Owner Operator Manual System & Technical Specifications and Installation Guides Click on the documents below to view, or download as a pdf. On-site Effluent Treatment National Testing Programme (OSET NTP) Performance Certificate Mar2018 Austin Bluewater Standard Tank Specifications and Excavation/Installation Instructions Residential Wastewater Systems Aerated Wastewater Treatment Systems Aerated Wastewater Treatment Systems (Technical Trade Book) ABS2000 Pumped Treatment System ABS2000 Flout Treatment System ABS2000 Ultra Flout Treatment System ABS2500 Treatment System ABS3000 Treatment System Resources: Taylex Lightweight Polyethylene Treatment System Taylex Excavation & Installation Procedures Taylex Poly ABS2000 Resources: Septic Primary Septic Treatment Systems B33P: 3300L Septic Tank with Pump Installed B33F: 3300L Septic Tank with Flout B52-P: B52 Pumped 3 Chamber Septic B52-G: B52 Gravity 3 Chamber Septic B52-F: B52 Flout 3 Chamber Septic B52UF: B52 Ultra Flout 3 Chamber Septic B90P B90G B90F - Ultra Flout Septic Tanks - Concrete ST16: Septic Tank 1,600 litre ST33: Septic Tank 3,300 litre ST33Fi: Septic Tank 3,300 litre (Filtered) ST65: Septic Tank 6,500 litre ST65Fi: Septic Tank 6,500 litre (Filtered) ST10: Septic Tank 10,000 litre ST10Fi: Septic Tank 10,000 litre (Filtered) ST20: Septic Tank 20,000 litre ST20Fi: Septic Tank 20,000 litre (Filtered) Commercial Systems ABC5: Modular Commercial System 5.0m3 ABC10: Modular Commercial System 10.0m3 ABC15: Modular Commercial System 15.0m3 ABC20: Modular Commercial System 20.0m3 Holding Tanks HT33: Holding Tank 3,300 litre HT65: Holding Tank 6,500 litre HT65a: Holding Tank 6,500 litre (Alarmed) HT10: Holding Tank 10,000 litre HT10a: Holding Tank 10,000 litre (Alarmed) HT20: Holding Tank 20,000 litre HT20a: Holding Tank 20,000 litre (Alarmed) Water Tanks WT33: Water Tank 3,300 litre WT65: Water Tank 6,500 litre WT10: Water Tank 10,000 litre WT20: Water Tank 20,000 litre Oil & Grit Interceptors OG15: Oil & Grit Interceptor 1,500 litre OG33: Oil & Grit Interceptor 3,300 litre OG65: Oil & Grit Interceptor 6,500 litre Note: HD lids and drawings are available on request Grease Traps GT15: Grease Trap 1,500 litre GT33: Grease Trap 3,300 litre GT65: Grease Trap 6,500 litre Pump Stations, Pumps and Pump Chambers PC1500: Pump Chamber 1,500 litre (Concrete Construction) PC1500V: Vortex Pump Chamber 1,500 litre (Concrete Construction) PC1500M: Macerating Pump Chamber 1,500 litre (Concrete Construction) PE PC 1300: Pump Chamber 1,300 litre (Polyethylene Construction) PE PCV 1300: Vortex Pump Chamber 1,300 litre (Polyethylene Construction) PE PCM 1300: Macerating Pump Chamber 1,300 litre (Polyethylene Construction) Wastewater & Grease Trap Filters PL-122: Effluent Filter PL-525: Effluent Filter PL-625: Effluent Filter Grease Trap Gravity Effluent Filters Air Blowers Linear LA80 XP 80 Control Panels Austin Control Panels Irrigation Drip Line IG1: Sub-surface Dripper Line OG1: Surface Laid Dripper Line M1: Mounded Dripper Line DLSc1: Drip Field Layout Schematic Sundry Components FC1600: Flout Chamber 1,600 litre 9" Disc Diffuser Float Switches Development of Biofilm on BIO-BLOK 150 Technical Specifications BIO-BLOK 150

Water, Holding & Storage Tanks Our holding and storage tanks are specifically designed and manufactured for multiple purposes including water storage, wastewater collection, fire fighting protection, industrial use & stormwater detention. Tanks are designed to be installed above & below ground providing a cool, clear and healthy water supply. They are designed to withstand fire, rust and algae growth Concrete storage tanks are impervious to damaging ultraviolet sun rays, and are non-toxic providing a cool, dark environment for water storage. All our tanks are manufactured to AS/NZS 1546.2008. AS/NZS 1547.2012. ​ Get in touch with our sales team today and they can talk you through your options specifically suited to your needs. Looking for technical information? Go to resources Want to know more? Contact our team today! 0800 287 846 sales@austinbluewater.co.nz

Sundry Components We have a selection of system components suitable as replacement, new or retrofitting. The below is a sample of some of the components we stock. Contact us for recommendations and suitability. ​ If you have any queries, just pick up the phone and give us a call, or send us an email. We are always very happy to help. Flouts Disc Diffusers Bio-Blok Float Switches Flouts A Flout provides a power free way of dosing an effluent field. How do flouts work? When the chamber is full the flout is triggered and discharges a fixed dose (dose depends on chamber size and Flout length). This provides a more even distribution of the field when compared to gravity and as a result can extend field life. Not suitable for all sites and dispersal methods, this will usually be specified by your wastewater engineer or speak to the Austin Bluewater team to see if this is the correct choice for your site. Looking for technical information? Go to resources Disc Diffusers In the wastewater treatment process, aeration introduces air into the liquid, providing an aerobic environment for microbial degration of organic matter. The purpose of aeration is two fold: To supply the required oxygen to the micro organisms To provide mixing to allow micro organisms to come into intimate contact with dissolved and suspended organic matter The most common and proven method is subsurface, using fine air diffusion. Fine air diffusion is preferred as the most efficient method due to its efficiency and lower power costs to operate. Looking for technical information? Go to resources Bio-Blok® BIO-BLOK® is the ideal filter medium for new wastewater treatment plants as well as for renovation of existing installations. Compared to traditional activated sludge treatment plants, the application of the BIO-BLOK® elements could increase the efficiency by up to four times. Therefore, in most cases the installation costs are reduced significantly. ​ The BIO-BLOK® elements, developed by EXPO-NET Danmark A/S, are well-tested products that have proved to be very efficient in the bacteriological treatment of domestic sewage, industrial waste water and water from aquaculture. ​ The BIO-BLOK® is constructed and made of oval-shaped net threads with a given diameter. If the thickness of these threads grows due to coating of biofilm, the specific biologically active surface grows as well. Looking for technical information? Go to resources Float Switches Commonly used to control pump activation/level control and for high water level warnings. Available in varying cord length and rated for the wastewater environment. Bianco Pump Float Switch Product Description Used as input signal to control a pump through control panel and other ancillary equipment. Technical Data • Rated Voltage: AC: 250V • Maximum Current: 10Amp • Frequency: 50-60Hz • Max. Operating Temperature: 50ºC • Protection: IP68 Looking for technical information? Go to resources Want to know more? Contact our team today! 0800 287 846 sales@austinbluewater.co.nz

Pump Stations & Pumps Austin Bluewater supply, design and build a large range of pump units and packaged pump stations for sewage, wastewater and stormwater requirements. Pump Stations are available in both concrete (strength and durability) and polyethylene (lightweight for ease of transport and install). ​ We provide durable and reliable solutions for sewage pumps and pump stations. ​ Get in touch with our sales team today and they can talk you through your options specifically suited to your needs. Looking for technical information? Go to resources Want to know more? Contact our team today! 0800 287 846 sales@austinbluewater.co.nz

Residential Systems We have a wide range of biologically engineered systems to manage your wastewater at your residential property. Whether you're on a lifestyle block just beyond the town boundary or a rural property some distance away, we'll have a solution for you. ​ Below is an introduction to each type of wastewater management system, how they work, the property they are best suited for, and what you can expect from the systems. ​ If you’re unsure, just pick up the phone and give us a call, or send us an email. We are always very happy to help. Aerated Wastewater Treatment Systems Lightweight Polyethylene Treatment Systems Water Storage / Stormwater Detention Septic Treatment Systems Advanced Wastewater Treatment Systems Our team have engineered the ABS2000, ABS2500 & ABS3000 – biologically advanced, aerated wastewater treatment systems that don’t just dispose of wastewater they treat it, resulting in a liquid that can be put to use irrigating your land. The system features multiple treatment and aeration chambers and filters to process and treat the sewage and wastewater from your home. ​ Unique to the ABS2000 are the additional diffusers in the aeration chambers resulting in higher quality effluent with lower nitrogen levels. In addition, a purpose-built clarifier assists with the final settling of sludge which is collected and returned to the primary chamber for further treatment. The final stage in the process is the pump-out chamber which discharges highly treated effluent to the irrigation disposal field. A dripline can be placed either into a shelter belt of trees or a garden, providing valuable irrigation. How it works... A Electrical Controls B Blower C Filter D Pump Step 1: All sewage and wastewater from your home flows into this chamber then into chamber 2. ​ Step 2 : All waste is treated and dispersed in an odourless process before flowing by displacement into the aeration chamber. ​ Step 3/4: Our unit is unique because it incorporates two aeration chambers with additional diffusers for higher quality effluent with lower nitrogen levels. Step 5: Another unique feature is the purpose-built clarifier assisting with the final settling of sludge, which is collected and returned to the primary chamber for further treatment. Step 6: Final settling/ irrigation pump out chamber discharges the highly treated effluent to the irrigation disposal field for reuse in the environment. Best suited to… Advanced Wastewater Treatment Systems (AWTS) can be utilised by any property whether they are considered lifestyle or rural. The high level of treatment makes the treated effluent suitable for dispersal within all soil types. Advanced Wastewater Treatment System Brochure ABS2000 Download the brochure Looking for technical information? Go to resources Lightweight Polyethylene Treatment System The Taylex ABS2000 system is specifically designed and rotomoulded as a one piece tank using sandwiched closed cell polymer foam to make tanks light, strong and durable, with no sealants, glues or flimsy internal materials for walls or panels. It is designed to last the lifetime of your house, and because it is one piece construction, it allows for ease of installation. Taylex “World Series” uses only the highest quality materials to ensure long lasting products. Linear air blowers used in our system are designed to last twice the life of comparable diaphram blowers and with less maintenance. Our controllers are designed for functionality and self diagnosis. An alarm code will be displayed if anything abnormal occurs within the system. ​ We only use products that will withstand the harsh environments they are working in. All electrical products, such as the aerator, irrigation pump and controller use 3-pin plugs for ease of replacement. The Taylex “World Series” System is a natural organic system which employs natures own resources to reduce wastewater to a clear, odourless liquid in 24 hours. How it works... Sectional view of plastic tank internal showing one-piece construction. Sandwich closed cell foam polymer – lightweight and strong Step 1: All wastewater from the home flows by gravity into the primary pre-treatment chamber of the TWS, and then into the secondary pre-treatment chamber by way of a mid-water take off. Solids are allowed to settle to the bottom of these chambers and a crust forms on the top. This naturally occurring crust stops odour from escaping from these chambers. Anaerobic (no oxygen) bacteria establish themselves in these chambers and partially digest the organic matter. Any untreatable and potentially harmful solids are retained within these chambers. The mid-water liquor between the bottom sludge based layer and the surface crust then flows by displacement into the aeration chamber. ​ Step 2: Air is introduced into the aeration chamber by way of a small Aerator with an air diffuser located at the bottom of the chamber. Aerobic (oxygen loving) bacteria proliferate and digest most of the remaining organic material. Fixed biomedia assists the retention and growth of the biomass. ​ Step 3: The liquid then flows into the clarification chamber for final settling. Sludge is removed from this chamber via an air sludge lift and is returned to the primary pre-treatment chamber for further treatment. ​ Step 4: The treated effluent passes through a plate filter to settle out any floating solids. The treated effluent is stored in the irrigation chamber until sufficient water activates the automatic submersible irrigation pump via a float switch. ​ Step 5: The automatic irrigation pump discharges the treated effluent to the irrigation field for reuse in the environment. Best suited to… This lightweight advanced secondary wastewater treatment system is perfect for sites with difficult access or where cranes are not easily available. Taylex Lightweight Polyethylene Treatment System Brochure Download the brochure Looking for technical information? Go to resources Water Storage / Stormwater Detention Austin Bluewater manufacture and supply a wide range of water storage tanks from 3,000 litre to 20,000 litre capacity in various dimensions and configurations. All our tanks are manufactured in one piece monolitiaic pre-cast steel moulds for strength and durability. Austin Bluewater tanks incorporate a strong steel mesh framework finished in 40mpa concrete. Tanks are able to be completely buried to lid height, with engineered designed lid structures to suit applications where lid may be covered. Concrete tanks are thicker and made dense in wall structure allowing stored water to remain cooler than plastic, therefore minimising any algae/bacteria growth in water. Our concrete water storage tanks are convenient and reliable in the event of fire. Looking for technical information? Go to resources Septic Treatment Systems Untreated household sewage would quickly clog any soil structure if applied directly to the soil. Our team have engineered the B33, B52 and B90 Septic Systems. The function of the septic tank is primarily as a settling tank, allowing solids to settle to the bottom of the tank with fats and grease floating to the surface. The middle clear zone allows for draw off into a secondary chamber. Modern septic tanks generally include a bacteriological filter. Septic tanks may have one or two compartments with an additional chamber for a discharge pump. The treated water is then dispersed on to your property. How it works... 1: Inlet from Dwelling Untreated wastewater enters system at this point from residence/commercial application. ​ 2: Primary Treatment Chamber In this chamber, solids settle to the chamber floor and fats and oils float to the surface leaving a clear zone in the middle. Anaerobic bacteria assist in the breakdown of collected solids. ​ 3: Secondary Treatment Chamber This chamber acts as a back up to chamber one enhancing treatment quality. ​ 4: Polylok PL525 Filter This effluent filter is rated for up to 37,000L/day making it one of the largest filters in its class. It has 525 linear feet of 1/16” filtration slots as well as an automatic shut-off ball. When the filter is removed for cleaning, the ball will float up and temporarily shut off the system so solids won’t leave the chamber. ​ 5: Dispersal Chamber or Final Treatment Chamber Depending on the configuration, this chamber can include a discharge pump, flout or gravity discharge/additional treatment chamber . ​ 6: Discharge Pump Various discharge options are available, depending on design engineer and local council requirements. Our technical engineers can specify pumps to suit. ​ 7: Controls Panel (Powered systems only) Alerts the owner in the event of a system fault. Treated effluent discharged via engineered disposal trench. Service access points Outlet Primary 1 to Primary 2 chamber Discharge to underground dispersal unit Underground dispersal unit Best suited to… Sizing and suitability of septic tanks will vary depending on: Design engineers and council specifications Soil types and level of treatment specified by engineer Number of bedrooms and sizing of dwelling Septic Treatment System Brochure B33 / B52 / B90 Download the brochure Looking for technical information? Go to resources Want to know more? Contact our team today! 0800 287 846 sales@austinbluewater.co.nz Contact our team

Commercial Systems Commercial wastewater treatment systems consist of varying configurations, our systems being of modular design and able to treat hydraulic flows from 3m3 to 50m3 per day. Our advanced commercial wastewater systems are specifically designed and manufactured suitable for commercial entities such as accommodation complexes, recreation facilities, camping grounds, shopping malls, schools and factories. Our systems can be installed on any terrain, including hillsides and hard to access areas. ​ Our sustainable systems treat wastewater through the aerobic digestion process, enabling micro organisms to transform wastewater into a clean odourless liquid, allowing disposal via drip Irrigation into soil for final treatment. The systems are manufactured in a modular form configuration. Robust extended aeration technology and minimised control systems allow for low maintenance of the systems. As extended aeration systems are modular they may be sized for any application, and may also be expanded at a later date to suit an expanding application. ​ Get in touch with our sales team today and they can talk you through your options and design a customised system specifically for your needs and property. Looking for technical information? Go to resources Want to know more? Contact our team today! 0800 287 846 sales@austinbluewater.co.nz

Grease Traps and Oil & Grit Interceptors We have a range of engineered systems suitable for your commercial entity. ​ Below is an introduction to the different systems, how they work and what you can expect. ​ If you have any queries, just pick up the phone and give us a call, or send us an email. We are always very happy to help. Grease Traps Oil & Grit Interceptors Grease Traps A grease trap's function is to remove grease from the wastewater stream to achieve acceptable standards before discharging into a sanitary sewer system. Precast concrete grease interceptors are the most effective choice for grease removal, they are watertight, durable and easy to install. Manufactured with high strength steel reinforced concrete, these come in a range of sizes to suit different applications. Trafficable options are also available if required. Multi chamber systems retain grease and fat by allowing them to settle on the surface and allowing the clean water to pass through. Specifically designed grease filters can be added to these systems when a higher level of treatment is required Looking for technical information? Go to resources Oil & Grit Interceptors Oil & Grit Interceptors are the technical solution for the separation of oil & grit from stormwater runoff at fuel stations, car parks, commercial spaces, contracting environments and industrial wash down bays. The interceptor uses gravitational force and varying densities of oil and water to remove oil from drainage. Oil and grit interceptors are an effective and simple solution to separate and store grits and all types of oils from lightly contaminated storm water and wash-down water. They are required for the separation of heavy solids (sand & grit) and floating hydrocarbons from storm water or wash down areas. They are typically used in industrial and commercial applications where there is potential risk for contamination from hydrocarbon products into waterways. The multi chambered treatment tank is installed close to the collection point (to ensure the oil reaches the interceptor before it emulsifies or pollutes the area) allowing for the storm water / wash down water to flow into the settlement chambers prior to entering a storm water lateral or disposal system. Features… Multi-chambered tank design - engineered for effective grit and oil separation Watertight construction of tank preventing water ingress Manufactured using steel reinforced 45mpa commercial strength concrete Robust design for commercial applications Swift lift anchors to ensure easy manoeuvrability and cartage Option to customise design to suit the application including engineers PS1 for loading design. Options for cast iron manhole covers Customised options for inlet and outlet pipework Engineered designs for heavy duty trafficable lids Best suited to… The Austin Bluewater Oil & Grit Interceptor can be used in the following applications: Driveways Loading bays Small sealed carparks Commercial carwash facilities Wash down bays Depots or terminals Pre-treatment to a retention tank or pond Industrial yards Approved Standards Built to NZS 3109, Concrete Construction New Zealand Standard Oil & Grit Interceptors Technical Specifications Brochure Download the brochure Looking for technical information? Go to resources Want to know more? Contact our team today! 0800 287 846 sales@austinbluewater.co.nz

Control Panels We offer a variety of Control Panels for our large range of systems relating to both sewage and stormwater discharges. Our Control Panels are compact and easy to operate ensuring steady and reliable performances for all systems. All panels are designed for outside operation. For other specialist controllers and applications we are able to offer additional functionality within our extended range. Basic Pump controller - Model EZI Advance Pump Controller Universal Pump Controller Domestic Wastewater Treatment Plant Controller At Austin Bluewater we are able to offer recommendations on the suitable product for your particular requirements. Looking for technical information? Go to resources Want to know more? Contact our team today! 0800 287 846 sales@austinbluewater.co.nz

Wastewater & Grease Trap Filters Austin Bluewater supply a range of filters for wastewater, septic tanks and grease traps that are suited to various levels of filtration and flows. Get in touch with our sales team today and they can talk you through your options specifically suited to your needs. Polylok Bacteriological Effluent Filters Polylok filters are a cost effective, high quality product specifically designed for filtering and reducing the BOD (organic content) of wastewater. The unique feature on the full range of Polylok P.L. filters is an automatic shut-off ball. When the filter is removed for regular servicing, the ball will float up to prevent any solids from leaving the chamber, which otherwise could result in blockages to pumps or field drains. Available in various sizes and configurations to suit individual applications. Each design is patented and NSF certified. Grease Trap & Effluent Filters We also stock a range of effluent filters from other major brands including Zabel and Taylex. These include filters that can be easily retrofitted to existing systems. Looking for technical information? Go to resources Want to know more? Contact our team today! 0800 287 846 sales@austinbluewater.co.nz

Irrigation Dripline The use of drippers to apply treated wastewater to the land application area is an efficient method of wastewater disposal. A correctly maintained Aerated Wastewater Treatment System (AWTS) can also provide water for your garden. However, dripper systems that are not well designed, incorrectly installed and poorly maintained can pose a significant public health risk and environmental hazard. There are two methods of discharging wastewater through driplines to a land application area; covered surface or shallow subsurface drip irrigation systems. The choice is based on personal preferences and site constraints. ​ Discharge Standards Wastewater discharged by drippers must go through secondary treatment and must meet specific standards (better than BOD5 20grams/m3 and TSS 30grams/m3). Some more rigorous parameters are set out in NZS 1547:2012 Appendix M section M2.1. General Guidance This information applies to all dripper based land application areas. The renovated wastewater is discharged from drippers along the length of the flexible, low density polyethylene dripline. The drippers can be moulded into the dripline or mounted externally. Provision must be made in the design of the dripper to prevent root intrusion. A disc or mesh filter must be installed on the pump discharge line to protect the dripline from any solid particles found in the wastewater which have the potential to clog drippers. The mesh/disc filter must be 130 micron in size. The driplines should be 1m apart. The drippers shall be pressure compensated and antisiphon type. The drippers have a variety of flow rates and spacings. The dripline should be selected and spaced at sufficient intervals to ensure the Design Irrigation Rate (DIR) in mm/day is not exceeded and that effluent is distributed evenly. Where the land application area is steep or undulating a non leakage dripline should be used. Driplines must not exceed 100m in length and shall be placed across the slope. The dripline must be coloured purple or have a purple stripe to indicate that it contains wastewater. Provision shall be made for flushing of the lines whenever the AWTS is serviced. The land application area should be setback at least 3m from dwellings and other buildings and 2m from boundaries. Set back distances from wells and water bodies or drains also apply. The location of the land application area and the driplines should be shown in the as-built plan. The as-built should also show buildings and boundaries. Photos can supplement the as-built. Covered Surface Drip Irrigation This additional information applies only to covered surface drip irrigation land application systems. The dripline used for surface irrigation must be pegged to the surface of the ground and covered with a mulch or granulated bark. Mulch or bark has a large surface area which assists in evaporation of the wastewater. The mulch must have a depth of at least 150mm and must be renewed at intervals to maintain the required depth. Some mulch decomposes quite quickly and will need replenishing frequently. The mulch must not be allowed to erode or decompose so that the drippers are exposed. The land application area must be planted to ensure evapo-transpiration of the effluent. Design and Construction This method is used when the land application area is to be planted. Before construction, all overgrowth must be removed from the land application area. The overgrowth could be sprayed with a herbicide or cut to a low level. The ground surface should be scarified with a rake or similar, before placement of the dripline. All pipework feeding the driplines must be buried to a depth of at least 200mm to reduce the risk of damage. Looking for technical information? Go to resources Want to know more? Contact our team today! 0800 287 846 sales@austinbluewater.co.nz