How to Install a Graywater System

Learn how to save money on your water bill by using graywater for landscaping and non-potable uses.
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Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: DK - Do It Yourself Home Improvement ©2009 Dorling Kindersley Limited

Photo By: Gary Ombler ©2007 Dorling Kindersley Limited

Photo By: Gary Ombler ©2007 Dorling Kindersley Limited

Prepare to Add a Graywater System

A small-scale graywater system can be easily installed without professional help. These systems come in kit form with clear instructions. In addition to a filtration unit, you will need to buy extra waste pipe and the right connections, as well as a compatible water barrel. This system is ideally suited for connection to bath or basin wastes. To start, mark on the waste pipe where you will fit the combination outlet. Allow space for the cut ends of the pipe to fit into the sockets of the outlet.

Cut the Existing Pipe

Use a fine-toothed saw to cut out the section of pipe, following the guidelines as accurately as possible.

Mark Position of New Pipe

Mark on the wall where you want to route the drainage pipe outside. Do this by temporarily fitting the outlet, or by holding it in the correct position.

Fit the New Pipe

Drill a hole at the marked position, using a core drill bit. Fit a piece of waste pipe long enough to extend through the wall.

Add an Elbow

Cut back the pipe on the exterior wall to a suitable length for connecting an elbow. Position the elbow on the cut section.

Attach the New Waste Pipe

Fit lengths of waste pipe from the connecting elbow down to a point above, and adjacent to, the water barrel. Screw in brackets to fix the pipe.

Assemble the Graywater Filter

Assemble the filter unit and place it on the water barrel, following guidelines about filter alignment. Fit the hose tail adaptor to the base of the waste pipe.

Attach the Graywater System

Use the hose to join the pipe to the filter. For all waste-pipe joints, use solvent cement to secure them in place.