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Fluid Categories for Enduramaxx Tanks

Fluid category 1

Wholesome water supplied by a water undertaker and complying with the requirements of regulations made under section 67 of the Water Industry Act 1991.


Fluid category 2

Water in fluid category 1 whose aesthetic quality is impaired owing to

  • a change in its temperature, or
  • the presence of substances or organisms causing a change in its taste, odour or appearance,  including water in a hot water distribution system.

Fluid category 3

Fluid which represents a slight health hazard because of the concentration of substances of low toxicity, including any fluid which contains

  •  ethylene glycol, copper sulphate solution or similar chemical additives, or
  • sodium hypochlorite (chloros and common disinfectants).

Fluid category 4

Fluid which represents a significant health hazard because of the concentration of toxic substances, including any fluid which contains

  • chemical, carcinogenic substances or pesticides (including insecticides and herbicides), or
  • environmental organisms of potential health significance.

Fluid category 5

Fluid representing a serious health hazard because of the concentration of pathogenic organisms, radioactive or very toxic substances, including any fluid which contains:

  • faecal material or other human waste
  • butchery or other animal waste
  • pathogens from any other source.