Water Supply Industry Interpretations and Advice
- Area of Interest : Backflow prevention
- Topic : Fluid category
- Title : Swimming pools in domestic and non-domestic premises and hose union taps
- Clause Reference : Schedule 2 paragraph 15 & G15.3
- Reference Number : B13
- Decision Date : February 2002 (Revised September 2010)
Whilst the water in a swimming pool is always categorised as a fluid category 5 risk hose union taps in private dwellings used at the poolside, provided that:-
- an air gap between the outlet of any attached hose and pool water is maintained at all times and the hose is not immersed or submerged in pool water; and
- any hose attached is fitted with a self closing trigger outlet
may be regarded as a fluid category 3 risk and as such could be protected against backflow by means of a double check valve - insulated against freezing where appropriate.
Hose union taps at poolside in non-domestic premises may providing the same conditions are met be protected against backflow by an arrangement offering a minimum of fluid category 4 backflow protection. For the purposes of this interpretation a domestic installation is a bath, pool or tank used by the occupants of a single privately owned or rented property for their and their friends, personal use. Where a bath, pool or tank is used by the occupants of more than one property the local water supplier will need to carry out a risk assessment to determine the level of risk.