• Environmental protection and safety: the filter sponge uses pure polyester fibers, odorless, without dyes, and refuses to add harmful substances to fish, shrimp, turtles, and other aquariums. • Effective filtration: plant-like fiber, low water resistance, high water permeability, effectively filters uneaten food, waste, rotten plants, dirt, and other large and fine particles suspended in the water, as well as increases oxygen solubility in aquariums. • Durable quality: the filter pad fabric is strong, soft, and elastic. It can be cleaned repeatedly and used for 6 months. • Multi-layer filtration: the filter wadding is divided into 3 layers, basic filtration, filtration, fine filtration, the dense fiber mesh at the bottom traps fine particles and produces crystal clear water in your aquarium. • Widely used: suitable for freshwater or saltwater aquariums, wet/dry filter, collection tray, drainage tank, tank filter.