FILTERABILITY INDEX APPARATUS (FIA)
The equipment comprises a filter unit, which contains a small plug of sand, through which the suspension flows downwards from a vessel containing the sample under test. Flow is controlled by a needle valve and observed on a variable area meter. Head loss is measured by a water manometer. The FIA enables water quality test to be made on a suspension. It can be used in routine control of water works and at sewage treatment works.
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