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Non-limiting examples of the more common foulants are fungal and bacterial strains, algae, protozoa, rotifers, higher life forms, oily residues, organic pipe coatings, soap and detergent residues, dust, inorganic salts, rust and other metal oxides, and hydroxides, such as for example the carbonates and sulfates of such metals as calcium, magnesium, copper, aluminum, iron and other substances which
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