How the Water Fittings Regulations rank contamination risk from wholesome mains (1) up to serious health hazard (5).
The Water Supply (Water Fittings) Regulations 1999 sort water into five fluid categories so you can match the right backflow protection to the real level of risk. The simple idea is that the dirtier or more dangerous the water could become at a point of use, the higher its category and the stronger the protection that point needs.
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