Environmental protection and safety: The aquarium filter sponge uses pure polyester fiber, odorless, no dyes, and refuses to add harmful substances to fish, shrimp, turtles and other aquariums. Can be cut into different sizes as you like. Efficient filtration: Imitation plant fiber, low water resistance, strong water permeability, effectively filtering uneaten food, waste, rotten plants, dirt and other large fine particles suspended in the water, and increasing the solubility of oxygen in aquariums. Durable quality: The fabric of the aquarium filter pad is strong, soft and elastic. It can be cleaned repeatedly and used for 6 months. Compared with other filter mats, you can save a lot of money. Multi-layer filtration: The filter wadding is divided into 3 layers, basic filtration, filtration, fine filtration, the dense fiber mesh at the bottom catches the fine particles together and produces crystal clear water in your aquarium. Widely used: Suitable for freshwater or saltwater aquarium, wet/dry filter, collection tray, drain tank, tank filter.