【Multi-Layer Filtration】This aquarium filter media combines mesh cloth, biochemical cotton, and filter sponges, providing a multi-layer filtration system. It effectively purifies water, ensuring a clean and healthy environment for your pets in fish tanks and ponds. 【Superior Filtration Performance】 The unique mesh structure design of this filter floss for fish tank and ponds offers excellent water permeability. It prevents blockages and overflow, maintaining optimal water quality with long-lasting filtration efficiency. The design is ideal for use as pond filter media or aquarium filter sponges. 【Customizable Sizing】The filter floss can be easily cut to different sizes as needed, making it a versatile aquarium filter sponge. It does not shed fibers, ensuring practicality and convenience in various aquarium and pond setups. Multi-Layer Aquarium Filter Media - Customizable Filter Floss and Sponges for Fish Tanks & Ponds