Page 630 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

The City & Guilds Textbook: Plumbing Book 1

High level grey water
storage cistern

Grey water
supply

Grey water feed
Grey water collection to cistern in the
roof space

Grey water
filter

Underground
storage cistern

Submersible
pump

p Figure 9.116 Grey water system feeding a WC

Rainwater harvesters can be installed at domestic or commercial sites, and
average households can expect to save up to 50 per cent of their water
consumption by installing a rainwater harvesting system.
Harvesters are usually installed beneath the ground in an underground
storage cistern, or on the roof of a flat-roofed building. A typical four-
bedroom house will capture enough water to keep a 5000-litre cistern in use
through most of the year.

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