Chemical Process
Transparent soaps (e.g. Pears) are

Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency
Metallic soaps with frothing agent from which glycerine has not been recovered
Metallic soaps with frothing agent and free stearic acid to achieve transparency
None of these

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Chemical Process
Presence of carbonaceous matter in the sewage

Reduces sulphate ions to sulphides causing obnoxious smell
Increases the quantity of chlorine used for its purification
All of these
Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures

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