Aquarium Filter Media Pad Dual Density Bonded Filter Floss Roll for Pond Water Purification Aquarium Filter Pad Premium True Dual Density Media Roll for Crystal Clear Water Fish OOTDTY new and high quality Features: The top layer's open fiber construction traps larger particles while the bottom layer's dense fiber mesh traps fine particles. Filter pad is perfect for freshwater or saltwater aquariums as a prefilter for wet/dry filters, sumps, canister filters, aquaponics system, and much more. Aquarium filter media roll is completely safe for all fish and other aquatic life and made without dyes. Specification: Type: Aquarium Filter Pad Material: Cotton Applications: Aquarium Fish for Tank Water Clean Features: Aquarium Filter Pad, Water Purification, Media Roll, Clear Water Fish for Tank Supplies Dimension: 12: app.12x100cm/4.72x39.37in 20: app.20x100cm/7.87x39.37in 30: app.12x100cm/11.81x39.37in Color: White Quantity: 1 Pc Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 Pc Aquarium Filter Pad