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home page » greywater system design chapter » filter detail page ... you are here
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The key to any greywater recycling system is a particulate sieve filter (graywater filter) to prevent leach field clogging. Greywater filters are relatively "self-cleaning" when installed correctly and never have to be replaced! The bottom slat configuration prevents gas-bubble-born sediment from flowing up and the 1/16 inch slots keep larger particles from getting out to your leach field. Unless you keep it out with a graywater filter, sediment such as laundry lint and kitchen waste eventually clogs the leach field soil with a bio-mat of waste. Always install a filter basin or the sediment will eventually cause your leach field to fail. We do our very best to make your custom kit's plans and parts as easy to install and maintain as is possible. Non-electric, passive greywater recycling systems don't have any moving parts, so there's nothing to break down and someday need to be repaired or replaced. | 
Tank shown with filter for illustration only |
click here or on any picture for the main greywater chapter with pricing
Here's the installation instructions for a graywater filter
Filter housing is black ABS plastic. Use multi-plastic cement when attaching to white/grey/green PVC.
Always prime all pipe joints first, before "solvent welding" with cement.
Here's the typical maintenance directions for a greywater filter
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Greywater tank fitting & filter kit $150*
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Greywater (septic) leach fields & planterbeds fail when poor design allows drain lines (laterals) to clog with sediment "biomat forming". Greatly increase the life expectancy any sewage disposal system with a filter to prevent solids greater than 1/16th of an inch from exiting the tank and clogging your leach field. Our fitting and filter kit can can convert nearly any water tank (barrel, vault, septic, or cistern) into a functional greywater filter basin. Sieve filters extend beneath the scum layer (fats floating on top of tank water), siphoning relatively clear effluent (greywater) from the middle. What flows in, flows out - tank level remains constant with solids, hair, and synthetic fibers sinking to the bottom. External-to-internal flow and sealed, gas-baffled end cap design prevents gas-borne solids (tiny particles) from floating atop gas bubbles and exiting the tank. You will never need to replace this greywater filter - just hose it off once a year, or less if everything seems constant the first year, when you check the general health of your tank. In normal usage, the filter schluffs accumulations of debris operating as nearly "self-cleaning" as possible. Greywater tank fitting & filter kit (all 4" diameter sewer/drain SDR35) includes: a threaded cleanout, inlet & outlet beveled pipes, rubber seal grommets, hole saw kit, inlet tee, outlet tee housing, three spare couplers, and a sieve filter with handle extension kit (fits 4" SCH40 and SDR35 pipe). Please note the filter housing is ABS plastic, so use a multipurpose glue when attaching to PVC outlet pipe. Always prime all glue joints first, before gluing. | 
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This 10 piece hole saw kit is included for free with our tank fitting and filter kit above for $150*. Every installation tends to be unique; this free hole saw kit allows you to put the inlet, outlet, and inspection holes right where you need them. A nice touch that we continue to include for no extra charge with every tank fitting and filter kit. Trying to cut a round hole by hand or with a jigsaw can be a challenge, at best. |
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Don't need the tank fittings (inlet, cleanout, grommets, hole saw and couplers)?
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Filter housing is black ABS plastic. Use multi-plastic cement when attaching to white/grey/green PVC.
Always prime all pipe joints first, before "solvent welding" with cement.
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Add our Greywater Settling Tank Kit (no filter) for $375*
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12 inch Riser Extension for Settling Tank is $95*
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Tank shown with filter for illustration only | Nothing beats a nice tank. While larger settling tanks are possible (we do not ship them outside of Colorado), but more volume is rarely necessary for residential applications. Part of the "trick" with tank sizing is to send greywater through the tank daily. Fresh greywater does not go "septic" - nutrients are passed along to the leach field before they have a chance to get stale, decompose, and start to smell with that distintive septic odor. This $375 (includes shipping that costs us about $125 these days) durable, buried vault is just the right size for residential use and has long been a standard part every system we sell. Use as the one and only greywater tank or install in series after a larger greywater settling or septic tank. Solid debris (lint, hair, and dirt) settles to the bottom and grease (fats) float to the top. A priceless tip is to avoid "natural" or otherwise bar soaps, which are 99% refined chicken fat - liquid soaps are advised (avoid bleach and borax for better plant health). Passive (non-electric no moving parts) graywater irrigation (or disposal) watering of greenhouses, orchards, and/or planterbeds is a breeze. As greywater efluent flows in, clarified graywater irrigation flows out; nice and simple like it should be for carefree passive operation. This 26" diameter by 42" tall greywater filter/settling basin kit includes: tank with lid, SDR35 rubber grommets for 4 inch inlet and outlet pipes (inlet hole not shown in picture), neoprene lid gasket, and tamper resistant lid fasteners to keep children out of tank. |
click here or on any picture for the main greywater chapter with pricing
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Shown here is one of the tricks we like to employ with greywater recycling systems: your washing machine needs its own pre-filter. A 5 gallon paint strainer bag is simply clamped to the end of the washer's effluent hose. The lint filter on your washing machine is very inadequate; newer models have a backflush cycle that actually sends all of the lint straight down the drain. We highly recommend that you pre-filter the hair and lint out of your washing machine effluent. This extra step will greatly reduce the need to periodically clean your greywater filter. |
Don't forget to put strainer baskets in all of your sinks, tubs, and showers. What does not get into the greywater system will never need to be cleaned out of it. Please read our septic chapter for detailed information on how filter basin settling tanks work. The same basic principles apply to greywater treatment and septic (blackwater) treatment with septic tank and leach field. The tank and fields are basically just smaller for greywater only treatment.
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Create An Oasis with Greywater
The revised and 145 page greatly expanded fifth edition of Art Ludwig's heavily illustrated book outlines numerous basic greywater recycling systems and serves as an excellent primer for anyone interested in building their own "septic" system.
Discussions include greywater filtration, pumps, leach fields, plant selection, soils, and basic plumbing.
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