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64
mineral salts
permanent hardness
pH value
pipe materials and jointing
pipe sizing
plumbo-solvent
pressure boosting
pressure drop
rainfall
reverse osmosis
sand filtration
sanitary appliance allocation
simultaneous demand
soft water
solar distillation
steam boilers
tank supplies
temporary hardness
urinal flush control
water flow
water main pipe sizing
zeolite
Water treatment
About 10% of the rainfall in the United Kingdom is used in piped ser-
vices. Storage in reservoirs allows sedimentation of particulate matter, and then
the water is filtered through sand and injected with chlorine for sterilization.
A slow sand filter consists of a large horizontal bed of sand or a sand and
granulated activated carbon sandwich (Thames Water). The carbon comes from
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