ilstar XP Filtration 30 PPI Foam Pad filter replacements provide reliable water filtration and particle removal. The micro filtration pads filter out small waste particles such as sediment, uneaten food, decaying matter and fish waste. The open-cell design catches contaminates while allowing water to flow freely through, circulating back into the tank. Filstar XP Filter Pads work to keep water cleaner and clearer when used regularly.