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The present invention comprises a non-aqueous slurry composition adapted to act as a rheology modifier and defoamer, upon addition to an aqueous system. The slurry comprises: (a) a particulate water-swelling polymer; (b) a water-insoluble, non-oxygenated, organic liquid vehicle which is a non-solvent for said particulate polymer; (c) a surfactant compatible with said organic vehicle and present...