The main problems with sanitary applications like water closet, washbasins, etc., are the growth of fungus and algae. A solution of chloride of lime (bleaching powder) in hot water will remove surface stains from ceramic ware and tiles. Simple application of moistened cloth in hot water and a little paraffin will effectively restore the lustre of porcelain and glazed surfaces. There are ready-made cleaning materials which are also available in market. If the sewage is to be treated by a septic tank, chemicals and detergents should not be used as they may kill the bacteria in the septic tank.
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