Aqua One Micro Pad Filter Media. Suitable for Freshwater and Saltwater aquariums. Removes free floating waste and debris before pollutants can break down into toxins. Aqua One filter pads give the user the ability to cut and shape their pads to suit any filtration system including: Hang on filters, Canister filters, Trickle / mini reef filter systems, top filters, internal filters, pond filters and any other aquarium or pond filtration unit. Size – 25.4 x 45.7cm