Filter System

Each system tailored to your needs

All ReWater systems work on the same principle – we use greywater (shower, tub, bathroom sink, laundry, reverse osmosis tail water) as it is produced according to your irrigation needs.

This process keeps that water highly oxygenated and good for plant life, which helps keep the filter systems and downstream piping relatively free of clogging from aerobic and anaerobic growth.

This principle also results in smaller filter systems and the space required to house it all.

The difference between our filter units is in the size of the pipe and components in each system. All of it is determined by your landscaping needs, not simply on the amount of greywater you have to use.

Single-family residences use a variation of our basic filter package with a polyethylene surge tank and 19” sand filter, having either 2” or 3” pipe connections and components.  2” handles water from up to 4 showers, tubs, and/or laundry drains, i.e., “fixtures”, and 3” handles up to 17 fixtures.

Our commercial sized systems often use traffic-rated concrete tanks, with large pipe connections, filters, and other components as required for the specific application.

Choosing the right system

With three decades of greywater irrigation experience, we first talk with you to determine your irrigation needs. From that, we determine how much greywater you need to irrigate that landscape. From there, we determine what role your topography will play in the system.

Single-family homes usually do not have enough greywater to irrigate the entire landscape in the peak summer months, so use supplemental water automatically provided by our controllers at the end of each day’s greywater cycle. Most of these systems are powered by a single 110 VAC electricity pump, though 220 VAC is an option.

Multi-family and other large projects usually have more than enough greywater to irrigate the entire landscape even during the hottest periods of the driest years. These systems are powered by 220 VAC and code requires our NEMA 4 pump relay junction box.

For multi-family, commercial, and institutional systems, it is common to design the system smaller than the maximum potential amount of greywater that could come from the building.

ReWater regularly consults on the design, engineering, permitting, and construction of greywater irrigation systems. We provide construction drawings when under contract.

How a ReWater system operates

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, where hair, lint, and other debris is trapped in tiny spaces between sand particles. Filtered greywater then travels out to a series of irrigation valves (1) as programmed for use in the landscape.

Our controller starts and stops in the irrigation programs 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, until all valves are satisfied.

Filter systems do not come fully assembled, as the plumbing design is different in each home. The schematic shown is for illustration purposes only.

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

Based on accumulated irrigation run-time, debris captured in sand filter (I) is removed by rotating 3-way valve (H), then opening city water valve (J), allowing city water to rush into the bottom of the sand filter, lifting the debris up and out, through one-way valve (N), and to the sewer. The controller then resets everything for irrigation again.

Larger systems have larger components, often using buried concrete tanks, but they all act on the exact same principle of filtering greywater through a self-cleaning sand filter and using it as it’s produced instead of storing it, keeping the water oxygenated and fresh, which is best for plants.