Fluid Category 1: Drinking water straight from the mains, Water used for cooking, food preparation and personal washing where it is still wholesome and potable., Fluid Category 2: Hot water from domestic hot water systems., Mixed hot and cold at taps/showers where only taste/odour/temperature/appearance has changed., Water softened by a domestic softener using common salt only., Fluid Category 3: Primary water in domestic heating systems (with or without inhibitors/anti‑freeze)., Water in domestic baths, basins, showers, washing machines and dishwashers., Water containing common disinfectants, Fluid Category 4: Water in commercial dishwashers, Fluids with toxic chemicals, pesticides, carcinogens or harmful environmental organisms, Food processing: food preparation, dairies, bottle washing plants, Fluid Category 5: Grey‑water recycling, sewage treatment and sewer‑cleaning plant water., Water from laboratories, medical/dental equipment with submerged inlets, Water from laboratories, abattoirs, butchery and certain industrial plants,

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