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Why Should We Use Water-based And Oil-based Defoamers There are several types of defoamers, including water-based defoamers and oil-based defoamers. Water-based defoamer is a modified silicone polydimethylsiloxane defoaming emulsion, which can remove foam in a water-based system and Oil-based defoamer is a liquid oily defoamer specialized in various oil-water systems.