ITEM NAME:Green Biochemical Filter Cotton Purification for Aquarium Fish Tank Filter Descriptio n Description: 100% Brand New, High Quality. This product is suitable for sea water cylinder, fresh water tank, water straw cylinder, size can be freely cut. The gaps and softness of the pores are suitable for the breeding of excellent nitrifying bacteria through expert analysis. Biochemical cotton is used to decompose waste and feed residue and improve water quality filtration. Reduce fish mortality. Clean water once a month, not blocked, not deformed, clean and reusable. Specifications: Material: filter cotton Color: green and white cotton Size: about 120 * 30 * 0.8cm Package Included: Aquarium Green and White Filter Cotton * 2 Note: 1.Due to the manual measurement and different measurement methods, the actual size could be slightly different. 2.Please be reminded that due to lighting effects and monitor's brightness/contrast settings etc, the color tone of the website's photo and the actual item could be slightly different. Whatever the ending's perfect or not, you can't disappear from my world Green Biochemical Filter Cotton Purification for Aquarium Fish Tank Filter.This product is suitable for sea water cylinder, fresh water tank, water straw cylinder, size can be freely cut. Biochemical cotton is used to decompose waste and feed residue and improve water quality filtration.