Filter Systems

Our filter systems:

NOTE #1: The state code requires that both the filter and the irrigation attached to it be approved for untreated greywater. Every ReWater filter system shown above used ReWater’s approved underground drip irrigation network and is a complete, permitted, operating ReWater® System.

NOTE #2: The ReWater® systems shown in the above links were engineered for a specific landscape. They will be incorrect for any other landscape.

All drawings and copyright are owned by ReWater Systems. All rights reserved.

Our Filters are Tailored to Irrigation Needs

Our single family and multi-family systems all work on the same principle. We size your system according to your landscape’s needs. They then filter and use the greywater immediately as it’s produced, according to the irrigation program(s) set by your landscaper. This process keeps organically rich greywater full of oxygen, which is great for plants.

Untreated Greywater is Better

We don’t “treat” greywater because plants prefer its nutrients and treatment is not usually required. Consequently, our time-proven greywater systems save homeowners tens of thousands of dollars and apartment owners hundreds of thousands of dollars in acquisition, operation, and maintenance costs for a graywater system.

This also results in relatively small filter systems that require very little space compared to treated greywater systems. In an apartment building, our system will save you additional tens of thousands of dollars in building footprint costs compared to treated greywater systems.

Rain Harvesting

Rain can be harvested and filtered then added to any ReWater system to satisfy Low Impact Development (LID) mandates and/or to earn LEED points. Don’t buy two systems just because you have two types of water. Ask us how to legally use the same system for both!

Do it Correctly the First Time

ReWater has been in the greywater irrigation business for over three decades. There’s probably nothing we haven’t successfully dealt with when it comes to on-site water reuse for irrigation. We regularly consult on the design, engineering, permitting, and construction of our greywater irrigation systems, with and without rain.

Call us at (eight oh five) 716-0104 to discuss providing you and your building professionals with construction drawings, permit acquisition assistance, and on-site construction guidance.

How a ReWater filter system operates

As shown in the drawing of the single-family system below, when float switch (M) rises on greywater in tank (A), if irrigation is programmed for that day, ReWater controller (13) signals pump (L) to start, which sends greywater to the top of sand filter vessel (I) and down through the sand. The sand traps the hair, lint, and other debris in tiny spaces between sand particles.

Filtered (“untreated”) greywater then travels out to a series of irrigation valves using ReWater’s emitters (1) as programmed for use in the landscape.

Our controller starts and stops in the irrigation program(s) throughout a 24-hour day based on greywater availability, sending a small dose of filtered greywater to each irrigation valve sequentially, as programmed for that day. This spreads greywater evenly around the landscape, until all valve times are satisfied.

At the end of each day, if all valves weren’t satisfied with greywater, valve (O) is opened to pressurize all the valves with city water. Then, any balance of irrigation is provided with city water.

How Our Filter Systems Satisfy LID

In Los Angeles County or the City of Los Angeles, supplemental city water is stored in a second tank, where a pump pressurizes the stored water on command. That tank receives additional city water via an air gap as needed to stay full. Incorporating a larger rain storage tank here can satisfy your LID requirements. All water is then used in the same irrigation system.

Each system could look a little different. For example, multi-family systems have two-chamber concrete greywater
surge tanks, but they all operate on the same principles. This schematic is for illustration purposes only.

A Self-Cleaning Filter

Our controller backwashes the sand filter based on accumulated irrigation run-time. On that signal, debris captured in sand filter (I) is automatically removed by the controller rotating 3-way valve (H), then opening city water valve (J), allowing city water to rush into the bottom of sand filter (I). That water lifts the debris out through one-way valve (N) to the sewer. Finally, the controller resets everything for the next day’s irrigation schedule.

Systems within Los Angeles County or the City of Los Angeles will store the city water in a second tank, where a pump will send the stored water through the sand filter for cleaning. That tank is often a large rain tank that satisfies LID requirements.