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Filter sponge for Oase SwimSkim 25 Package includes: 12 pieces 18 mm thickness, medium pore (20 PPI) Better biological filtering › See more product details; Product description Sanlili Replacement Sponge for Oase Swimskim 25 (Pack of 12); Product description Sanlili Replacement Sponge for Oase Swimskim 25 (Pack of 12); Sanlili Replacement Sponge for Oase Swimskim 25 (Pack of 12)