Contaminant - a substance that contaminates, Faucet - a regulator for controlling the flow of a liquid from a reservoir, Impurity - worthless or dangerous material that should be removed, Lead - a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey, Chlorine - used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water), Cistern - an artificial reservoir for storing liquids; especially an underground tank for storing rainwater, Sediment - matter that has been deposited by some natural process, Counterfeit - a copy that is represented as the original, Install - set up for use, Rinse - the removal of soap with clean water in the final stage of washing,

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