Dg. Stevenson, THE SPECIFICATION OF FILTERING MATERIALS FOR RAPID-GRAVITY FILTRATION, Journal of the Institution of Water and Environmental Management, 8(5), 1994, pp. 527-533
A UK standard for the specification, approval and testing of filtering
materials has recently been published by British Water (formed by the
merger of the British Effluent and Water Association and the British
Water Industries Group) in response to an identified need. This paper
reviews the considerations during the preparation of the standard and
provides a technical background. The approach has been to base the sta
ndard on parameters which affect the behaviour of the material during
filtration, rather than to specify material composition and appearance
, which are unimportant. Standards and specifications are a basis for
testing, and the inclusion of irrelevant parameters can lead to unnece
ssary work.