Water Supply Industry Interpretations and Advice

  • Area of Interest : Backflow prevention
  • Topic : Fluid category
  • Title : Hose union taps used in connection with spa, floatation and whirlpool baths
  • Clause Reference : Schedule 2 paragraph 15 & G15.3
  • Reference Number : B45
  • Decision Date : September 2010

Hose union taps used in connection with, whirlpool baths, spa pools and floatation tanks in domestic premises may, provided that:-

  1. 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
  2. any hose attached is fitted with a self closing trigger outlet

may be regarded as a fluid category 3 risk and as such can be protected against backflow by means of a double check valve - insulated against freezing where appropriate.

Hose union taps used in connection with whirlpool baths, spa pools and floatation tanks 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.