1) Ensure that the rate of flow in the tank is correctly maintained.
2) See that the tank is cleaned at proper intervals by scrubbing and/or hydraulic flushing.
3) Where coagulation is done ensure that:
- the correct dosage of chemical is used - weighing equipment for this purpose should be properly maintained;
- adequate storage arrangements for coagulants are made eg bags of aluminium sulphate and ferrous sulphate being hygroscopic should be stored in wooden bins. Ferric chloride, being corrosive should be stored inside rubber lined bags;
- adequate reserve of coagulants are kept;
- the operating staff are provided with suitable protection against hazards due to storage, conveyance, feeding or handling of chemicals.
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