Page 260 - 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
Rainwater is collected from the
roof by the guttering system
where it flows down the
rainwater pipe, through a
rainwater filter and into an
underground storage cistern

Grey water feed
to cistern in the
roof space

Grey water
filter
Underground
storage cistern

Submersible
pump

p Figure 5.7 Simple rainwater harvesting system

Black water
Black water is water and effluent from WCs and kitchen sinks that can be
treated only by a water undertaker at a sewage works.

Unwholesome water will be revisited in Chapter 9, Sanitation systems.

3 THE WATER TREATMENT

PROCESS AND DISTRIBUTION

OF WATER

In this section, we will look at the way the water we use every day for drinking,
washing and cooking is filtered, cleaned and sterilised to ensure that it is fit
for human consumption. The word we use to describe fresh, clean water is
‘wholesome’.

248

9781510416482.indb 248 29/03/19 8:57 PM