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$795 non-electric Greywater Disposal System with drywell leach pit kit detail page.
Click here for main greywater chapter with parts and pricing.

Greywater disposal system kits provide care-free graywater disposal with a do-it-yourself greywater drywell leaching pit. You don't have to reuse your greywater. If you simply want greywater disposal, we can sell you a passive (gravity drainage) graywater disposal system (basic kit and filter basin plus a drywell kit). It includes everything shown below: cleanout, filter basin, greywater filter and all of the other plumbing fittings you'll need, plus a drywell kit with vent and filter fabric for easy direct disposal of your household greywater. Our 800-563-9720 toll-free design and installation assistance is included in every graywater disposal system we sell! That's what makes our greywater disposal kits such a great value. Unlike the large catalog companies, we've personally experimented, installed, and serviced many different greywater system configurations over the years. We have the practical knowledge to ensure your graywater disposal project's success. Please note that even if you don't have to obtain a building permit for your greywater system now, it doesn't mean a future owner won't be required to. We highly recommend keeping resale value and future health code enforcement firmly in mind when considering graywater irrigation. Roof run-off cisterns are an excellent source of toilet flushing water, but recycling greywater to flush your toilet is simply not cost-effective and is potentially unhealthy. It is much easier, less expensive, and worlds safer to directly dispose of greywater in a leaching pit or irrigation field.

Our passive graywater disposal kits make diverting your greywater to a small leach pit a very doable project. Graywater from your home is piped directly to this extremely durable, buried vault where solid debris (lint, hair, and dirt) settles to the bottom and grease floats to the top. Yes, Grease and Fats... some of the most popular "natural" bar soaps are 99.9% refined chicken fat. That's why you must have a settling tank or your leach field will eventually clog and fail. As greywater flows in, clarified graywater irrigation flows out. Our graywater disposal kit works without any "moving parts". All of the fittings required to install your greywater filter/settling basin and one Drywell Kit are included*: tank with lid, rubber grommets for inlet and outlet pipes, neoprene lid gasket, and tamper resistant fasteners. Replacement and/or additional fittings are common four inch diameter sewer pipe available at your local plumbing or building supply store. *You provide only the straight (perforated and/or solid) sewer pipe from house to tank and from tank into leach field.

If you simply want to dispose of the greywater, you can buy our passive (non-electric gravity drainage) greywater disposal package for $795* delivered price includes shipping, which runs us well over $200 these days, and design consultation. One of the worst things for a septic system is to dispose of washing machine water directly into the septic tank. Even mild all-natural bio-degradable soapy water KILLS bacteria - it is the nature of soaps and detergents. And bacteria is what drives healthy septic system digestion and decomposition of toilet paper and solid waste in the septic tank. Diverting at least the washing machine water to a greywater disposal system will save your septic system from having to be pumped as often and prevent catastrophic failure of leach fields. Every graywater system we sell is a complete kit that includes all of the parts you'll need* PLUS toll-free assistance! This $795 greywater disposal system includes the deluxe settling tank, tank fittings and filter kit, and one complete drywell leach pit kit. System is capable of handling up to 800 gallons of greywater per day - plenty for any size residential home installation.

"Are we allowed to install this greywater system on our property" is not a question we can answer for you. We have been providing this same passive (non electric) greywater system for over twenty years now, but we do not follow constantly changing city, county, and state building regulations. The beauty of our time-tested design is it's based on a small-scale septic system and that should be seen as conventional to your local building officials. Unfortunately, with over 3000 counties in the United States, regulations changing from year-to-year, and interpretations of those rules varying from one inspector to another, it's never possible to say for certain 'what is allowed' locally. The county building department is your primary source of information on what is possible to install according to local 'code'. Rather than telephone them with questions, you should drive over in person and get a copy of their local Individual Sewage Disposal System ISDS Regs and also get a list of locally licensed soil engineers. The building department will confirm or revise your site plans once submitted for approval. Often the county inspector will assist you with site plans and design as a service provided for their permit filing fee. If not, they will refer you to a local engineering firm that can visit the property in person and design the system. We provide free consultation after the sale on installation procedures, system design improvements, and operational issues, but we do not provide any soil testing, on-site services, 'stamped' engineered plans, or 'advanced treatment' systems.

$795 Greywater Disposal Kit includes free design consultation along with the following complete system fittings & parts:

*  Settling Basin with lid and gasket material, plus rubber grommets to secure the four inch diameter inlet and outlet pipes.
*  Tank Fittings kit with threaded cleanout, inlet & outlet beveled pipes, inlet drop tee, couplers, and a 10 piece hole saw kit.
*  Graywater Filter with housing and handle. 'Self-cleaning' sieve is never replaced, just rinsed when you inspect tank sediment level.
*  One Drywell Leach Pit kit complete with vent and inlet tee fittings and fabric. One drywell is usually plenty with enough gravel in the hole.

$795* - FREE shipping
UPS Ground - lower 48 states only

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Client need only supply the four inch diameter sewer pipe from house to tank and from tank to drywell. Such PVC SDR35 standard four inch sewer and drain pipe is commonly available at any local hardware store.

Best practice is to place settling tank within 5 to 10 feet of foundation and disperse greywater at least 20 feet away from the home in the drywell.

One drywell in a large enough leach pit is standard practice, but two drywells can be installed for more surge capacity and long-term viability.

Inlet hole and fittings on opposite side are not pictured

Greywater settling basin cut-away with filter housing
Greywater disposal system with drywell

$795 greywater disposal system installed with the one drywell kit included. Note leach pit with drywell is normally placed at least ten feet away from settling tank and downhill to prevent 'floating' of the settling tank with water runoff from leach pit.

Two drywells in series

One drywell in a large leach pit is conventional, but two drywells can be installed in series, as pictured above, for additional initial surge capacity and long-term viability, especially in poorly percolating soils. Till soil at least a foot in base of leach pit for best percolation.

Settling basin with filter Greywater disposal system package with fittings and drywell kit

Place settling tank within 5 to 10 feet of foundation and disperse greywater at least 20 feet away from the home.

a host of GOOD, BETTER, BEST operation and design choices... just like any construction project

Best practice for any greywater system is to install an in-line settling tank before the leach pit (drywell) or leach field,
as included with the $795 kit above. Good enough is to discharge graywater directly into a single drywell. When disposing of a limited amount of graywater from BBQ patio sink, pool shower, warehouse mop drain, or barn cleanup area, one drywell kit at $169 delivered price is an economical option. Better yet is to install two drywells in series, one after the other, so the first drywell can act as a sediment catch. With two drywells, more clarified greywater is sent along to the second leach pit (or perforated pipe leach field) ensuring long term viability. Lint, hair, sediment, and fats build-up over time, eventually clogging the soil and gravel around your drywell... but that will take many years, with minimal attention. The less you flush down the drain, the less you will eventually remove from settling tank and the less chance of clogging your leach pit(s). Use of liquid soaps, screen traps in drains, and a washing machine with removable lint filter, virtually eliminates larger particulates. With proper attention to what goes down the drain, you are very unlikely to have to pump sediment yearly, but one should inspect yearly to be certain all is well. The greywater filter is self-cleaning to the extent that it should never clog and never need replacing. During inspection, you can pull the sieve filter out by its handle and rinse off any particulates with a garden hose, right back into the settling tank. Please be certain to wear skin and face/eye protection since material in settling basin is to be considered hazardous septic waste with possibly infectious bodily fluids. Please use professionally licensed septic waste hauler services to have accumulated solids pumped from the settling tank. If you have a septic system at your home, they should pump both tanks at the same time, usually once every 3-5 years.

Our drywells make excellent leaching pits for greywater and full-size septic systems alike. Gravel backfill around and under the drywell is not necessary, but will increase the drainage capacity and longevity of your leaching pit. One drywell with a foot of gravel under and around it will dispose of 200+ gallons per day in well-draining soils. Shown below is a sample installation with TWO drywells in series - bringing greywater in through the lid with a sanitary "San Tee" fitting. The first drywell acts as a sediment catch basin, providing more clarified greywater to the next leach pit in series. Venting your leaching pit system is most highly recommended and also provides a handy 4 inch diameter pipe inspection/cleaning port. Oxygen keeps the greywater drainage pit dry and the soil around it much healthier. Freezing is rarely a problem with running water underground and especially not an issue when you have enough gravel under and around the drywell. Frost does not form in a gravel bed, only in wet earth... don't worry about frost issues with drywells. You can always cap the vents in deep winter if need be, but eliminating the vent altogether is a classic design error.. Top loading through the san tee fitting with surface vent ensures maximum surge capacity for the drywell. We provide all of the fittings pictured with your kit (san tee, riser, coupler, vent, and geotextile fabric). Please note the geotextile fabric is included for installation above the gravel layer to extend the life of your leach pit. Keeping topsoil out of your gravel layer around the drywell is key to any installation.

click here or on images for the drywell installation detail page

Assembled drywell with sanitary tee inlet, riser, coupler and vent grate included in kit Drywell kits provide care-free greywater disposal, especially when installed in series so first can act as sediment catch

It is possible to install a drywell gravel-less, just using native soil for backfill if it percolates quickly, but for best results, place at least a foot or two of gravel under and around the drywell. Six inches of gravel, as noted above, should be considered a bare minimum only. DO NOT put gravel inside of the drywell, as that would defeat its purpose as a surge vessel.

One drywell in a large leach pit is conventional, but two drywells can be installed in series, as pictured above, for additional initial surge capacity and long-term viability, especially in poorly percolating soils. Till soil at least a foot in base of leach pit for best percolation.

Two drywells in series

extra gravel-less Drywell with complete installation kit are $169* delivered
*  FREE sanitary tee curved inlet 4" diameter S/D sewer drain pipe 3-way T fitting brings liquid in through top center knockout on drywell lid
*  FREE vent grate is a green, slotted plastic, four inch drain with riser and coupler fittings to vent your leach pit... which is very IMPORTANT
*  FREE geotextile fabric lays atop leach pit gravel, before backfilling with final soil, to prevent dirt and root intrusion - 24 square foot (3' by 8')
*  FREE Shipping UPS Ground to 48 states - we do not ship to APO, US Mail Box, Hawaii, Alaska, Puerto Rico, US Virgin Isles, Mexico or Canada

Greywater drywell

Drywell kit with lid
24 inch diameter - 29 inch tall
lid, three sides, 4" S/D inlet tee
green vent grate with riser & coupler
and 24 sq ft of geotextile filter fabric
$169*  free UPS Ground

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Three sides for stacking drywell

extra set of 3 side panels
stack drywells 53 or 77 inch tall
extends our drywell kit by two feet
free 24 sq ft of geotextile filter fabric
$119*  free UPS Ground

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Optional surface drain

optional surface drain
heavy-duty 7" by 10" tall drain
suitable for car traffic, it is placed in
middle of puddle, driveway or patio
bottom of this drain is run out to
drywell in your yard with 4" pipe
$35*  free UPS Ground

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Optional bottom panel

optional bottom panel
not used when disposing of water
for drywell use as sump pump base
or lid support in heavy traffic areas
NEVER drive vehicles over drywells
$35*   free UPS Ground shipping is ONLY when purchased at same time as the drywell kit

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geotextile fabric - professional duty 35 mil 5 ounce sq/yd woven for use with leach pits and percolation fields

The primary place for geotextile fabric is above the gravel layer of your leach field lines, French drain, or drywell leach pit. Additionally, one can line the outside walls/sides of the excavated leach pit or drain lines to keep soil from migrating into the gravel from sides. This sidewall protection is always recommended when soils are loose or sandy and would otherwise tend to wash soil into the gravel. Geotextile fabric is also used for wrapping perforated pipe-in-gravel French drains, as pictured at right, with fabric on the bottom of trench too. French drains are wrapped like a burrito, unlike septic leach field lines where the fabric is on the top and sides only. Protecting your leach pit and perforated pipe gravel from soil and root infiltration is crucial to long-term soil percolation and preventing leach field failure.

Geotextile engineering specifications

Geotextile filter fabric used for wrapping French drain perforated pipe

3 foot, 4 foot, 5 foot, and 6 foot wide professional-duty geotextile fabrics
pre-cut rolls of 30 foot, 60 foot, 120 foot, and full 250 foot long rolls

Professional strength, heavy-duty woven 35 mil thick geotextile fabric is hydrophilic treated to
allow air, water, and nutrients through its needle punched, multi-layer technology for a lifetime of service.

* Price includes UPS Ground Shipping
with no delivery to APO/FPO, mail boxes, Hawaii, Alaska, Puerto Rico, US VI, Mexico or Canada

3 foot wide

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4 foot wide

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5 foot wide

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6 foot wide

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10% discount on 2 or more full 250 foot long rolls of professional-duty geotextile fabric

250 foot long rolls of geofabric at a discount
Price includes free UPS Ground Shipping to 48 states.
No delivery to APO/FPO, mail boxes, Hawaii, Alaska, Puerto Rico, US VI, Mexico or Canada
Full roll material normally ships by the next business day.

10% off 2 rolls or more

$170 - 3 foot by 250' roll
$220 - 4 foot by 250' roll
$270 - 5 foot by 250' roll
$320 - 6 foot by 250' roll


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Coming soon... option to order custom length, cut-to-size material sold by the foot

3 foot wide

4 foot wide

5 foot wide

6 foot wide


Residential home sewage system (septic and greywater) leach fields, roof gutter runoff, driveway and yard drainage are common applications for drywells. It is not necessary to have multiple drywells, to dispose of more water, but you do need a larger hole in the ground (leach pit) filled with more gravel. And it is always a nice engineering touch to install at least two drywells in series, as per the sketch above. First drywell acts as a settling basin for dirt, leaves and other particulates, ensuring a long lasting system, by keeping the second drywell free of debris. Drywells can be stacked to increase surge potential with "capacity" limited ONLY by the size of the gravel filled hole (leaching pit). The drywell itself provides fifty gallons of dry (surge potential) but this quickly disperses into the surrounding leach pit filled with 3/4 to 1-1/2 inch crushed aggregate.

Please note you can't have too large of a leaching pit. When disposing of huge amounts of water, extra-large leaching pits ensure longevity of soil percolation. Local building department sets/dictates the equation (regulation code) used to determine minimum leach pit size for septic systems and yard drainage. A rule of thumb in well percolating soil is up to about 200 gallons per day, every day, with MINIMUM of One (1) foot of gravel under and around the drywell. Knowing the actual percolation rate of the soil is the only way of being certain, but 100 gallons of surge in slower percolating soils should be enough for most residential installations... in most soils. When ground water (seasonal or otherwise) is not present in the leach pit area, stacking drywells (deeper leach pit) is an easy means to increase initial surge capacity - 50 gallons per drywell.

click here or on any picture for the main greywater chapter with parts and pricing

As with any kit purchased from us, we can certainly work with you on specific site needs after purchase. For instance, the main consideration in a cold climate is keeping frost from penetrating down into soil surrounding the settling tank. Typically, this entails covering the area around tank (surface above) for at least three to four feet with a heavy duty tarp (8' by 8' or 10' by 10' size) to prevent moisture (frost) from being driven down to surrounding soil. Then place an at least 2 inch thick sheet of blueboard EPS foam insulation (4' by 4' minimum) directly above tank. You cut hole in center of sheet to slip circle of foam out for gaining access to settling tank lid. Dry soil is key to maintaining warmth since frost only penetrates down into moist soil. The drywell leaching pit and pipe to and from tank will not be affected by cold since it is running water, but laying the pipe in a thick gravel bed is standard practice for preventing frost from contacting the pipe (same applies to tank). Burying the system deeper is always an option to help in cold climates, but a foot or two for the tank is typical. The beauty of our greywater disposal system is that you can very easily convert it to a greywater recycling system later. A row of privacy bushes or a small orchard is typically the best reuse of greywater - a fruit tree can easily uptake 15 plus gallons per day and the pipes do not need to be pressurized. Please take this link to a detail page with typical greywater leach field sketches.

We have been designing and building greywater systems for almost twenty years now.
Should you have questions during installation or afterwards, we are here for you.
Kits are very easy to install with pre-cut pipe and fittings individually hand-labeled.
Fittings are standard 4" sewer & drain for ease of replacement and expansion.
Everything is tried and true - no mechanical parts, so it should last a lifetime.

Our greywater filter has 80 lineal feet of filtration area for up to 800 gallons per day treatment volume. A built-in gas deflector on bottom of filter provides secondary 1/2 inch filtration to prevent larger solids from entering the filter area inside. The patented flow reduces the trapping of solids in the filter by allowing solids to slough off and fall back into the tank for further digestion. 1/16 inch filtration slots, rather than mesh screens, provide much less surface area for solids to attach and promote the sloughing action. Filters feature a locking tab that securely locks the filter into its housing tee, preventing any chance of 'floating' by the filter and allowing solids to pass by. This design has served our clients well for over twenty years with nothing but positive feedback and great results. Very easy to clean when you inspect the greywater settling tank and filter never needs replacing.

These wonderful little greywater filters are included with every passive graywater irrigation kit.

This "self-cleaning" filter is the heart of our passive greywater systems. Keep in mind that besides the parts, our toll-free installation assistance is included in every graywater system we sell! That's what makes our kits such a great value. Unlike the large catalog companies we've experimented, installed, and serviced many system configurations over the years. We have the practical experience necessary to ensure your success and pack just about everything you will need with your kit, nicely labeled.

Link to greywater filter detail page

Complete set of parts, fittings, and filter shipped with greywater disposal system kit
Settling basin cut-away showing optional riser installed

Graywater irrigation systems can be very simple and non-electric when the top of your planterbed (leach field) is below the elevation of the home's effluent pipe. When used as the first settling tank of your greywater system, this filter basin acts as a grease trap. Typically, a drop tee is used to introduce incoming greywater subsurface (see sketch above) and not a direct discharge inlet pipe (as shown to the left). The direct discharge pictured here is only recommended when installing the basin in-line after an initial settling/surge tank.

Your 41 inch tall by 26 inch diameter filter basin includes an unauthorized entry resistant lid, greywater filter, and every gasket and pipe fitting you'll need to put it all together. Please note that 12 inch and 18 inch riser extensions are available if your filter basin needs to be buried deeper.

This 10 piece hole saw kit is included for free with our passive greywater kits. Every installation tends to be unique and 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 greywater kit. Trying to cut a round hole by hand or with a jigsaw can be a challenge, at best.

This hole saw kit makes installation of your greywater disposal kit a breeze.

click here or on any picture for the main greywater chapter with parts and pricing

Settling basin specification sheet

Greywater recycling filter specifications

drywell installation suggestions, tips and hints...

storm water drainage, puddles in yard, septic leach pit, and more NDS Flo-Well


Knock out or cut out the 1 inch ports to allow water to drain out. Hit the "X" marks on the inside of each panel with a small hammer. Rest the outside of the drywell atop a 2 by 4 laid close to the hole being removed. As you might guess, this is a great time to have a bored 10 year old handy. Knock out 4 inch port in top lid and side panels as needed for pipe connections.

If you are NOT planning to fill under and around with gravel, wrap landscaping fabric around the drywell (included) to prevent soil from entering the drain holes and secure in place with duct tape. When backfilling with gravel, install landscaping fabric above gravel layer (as per sketches at top of page).

Easy to install drywell kit solves roof runoff problems by taking gutter, driveway, and yard water away from your leaky basement.
Drywell kit installation

Backfill evenly around the drywell with soil or gravel, raising the level in stages to avoid tipping the unit. The drywell may be surrounded with stone if desired to increase leaching capacity, but do not fill the inside of drywell with stone. It is typical to use 1-1/2 inch diameter crushed gravel for a leaching pit, but anything down to about 3/4 inch will work. Do not use small "pea" gravel and avoid smooth river rock whenever possible.

Bury the drywell at least eight inches below the surface grade, if not a foot or two. The more soil coverage atop the lid, the easier it will be to regrow vegetation. A common approach in poorly percolating soils is to bring the gravel around drywell all the way up to finish grade. Exposed gravel will allow the leaching pit to get rid of water through evaporation in addition to percolation. These drawings do not highlight like the installation diagrams at top of page, but always vent your leach pit for best performance and soil health.

Only wrap drywell when not backfilling with gravel under and around Do not drive over drywells
Drywells can be stacked several sets of three sides higher

Understand that vehicular traffic atop drywell lid should be avoided and is not warranted by manufacturer. When a leaching pit is placed where vehicles may occasionally pass near, you should always consult a local soil engineer. Rock fill, poorly percolating soil, ground water and/or saturation of perimeter with runoff may dictate an advanced engineering approach we cannot supply you with. The minimal approach taken by engineers is to require a reinforced concrete base/pad under the drywell bottom panel and a 4 inch diameter Sch40 riser pipe from base to bottom of lid (vertical loading as per image above). In worst case scenarios, you might see engineers add a reinforced concrete pad atop too.

When stacking drywells, order the set of three side panels and assemble with the full kit of three panels and lid. Stabilize the stacked drywells with several half inch screws at each level and then lower the entire stack into the hole at one time. Backfill evenly to avoid tipping the stacked drywells.

When leaching roof gutter water, always vent the downspout to insure against backup/burping. In practice, this amounts to not sealing around where the rectangular gutter enters the four inch drain pipe.

For occasional foot traffic, the free surface vent grate supplied with $169 kit is adequate. In high traffic areas, the optional surface drain may be added. Either allows overflow of excess water and serves as an inspection & cleaning port.

Surface drain can be placed directly into the lid or a pipe can be run from the drain to drywell. Divert driveway and yard water runoff away from foundation to prevent leaky basements.

Use larger pipe at gutter drain to avoid burping and overfilling Surface drain can be installed remote to drain yard puddles

IMPORTANT NOTICE: It is your obligation to determine whether this product is suitable for the intended use and particular application. Consult your building officials to insure compliance with all building codes and requirements. These step-by-step instructions provided reflect mechanical assembly only. Additional information may be necessary to insure proper results for all applications. Consult with professionals to determine special soil conditions and structural requirements.

click here or on any picture for the main greywater chapter with parts and pricing

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please email with questions or concerns at 0186 CR 1400 in Silverthorne, CO 80498

phone 800-563-9720 or 970-262-6727 9am-4pm MST M-F or fax 720-293-1705

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