Rio Phos Pad - Universal Filter PadThe Rio Phos Pad is a universal filter media that provides two types of filtration in one. This versatile pad is treated with special elements to reduce phosphate levels and remove free floating particles in your aquarium or pond, and can be cut to fit a variety of filtration systems to keep your water clean and healthy. 2 in 1 filter pad Reduces phosphate levels and removes free floating debris Universal filter pad just cut to fit For freshwater