OASE BioSmart 1600 Filter Foam- Blue by Oase $ 16.99 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Replacement Blue Filter Foam (40973) for OASE BioSmart 1600 Pond Filters. Filter Foams are sold individually. Blue Filter Foam Fits: BioSmart 1600