SHUNTING Bio-cotton Filter High-density Sponge Foam Pool Aquarium Fish Tank Water Filter Cotton (25PPI-50x50x4cm)

• Multiple sizes with free cutting to improve filtration efficiency.
• Activated carbon can promote retention of nitrifying bacteria, improve water quality and reduce fish mortality.
• Three-hole non-toxic foam material is adopted to ensure excellent permeability.
• High porosity, big pore openness, high air circulation, effective absorption, reusability after cleaning.
• Vacuum sealed, dust-proof, moisture-proof, mildew-proof and easy storage, suitable for all types of aquarium. (After unpacking, keep the filter sponge for 12 hours or wash it with warm water, it will immediately return to original state.)

Why do we need to use biochemical filter cotton? Good shading performance, reduce algae growth, moderate pores, high density of nitrifying bacteria, good filterability, stable water quality, reduce fish mortality. Such a combination can achieve the best effect. Material: biochemical cotton  Color: Black.  Size: 50 (L) x50 (W) x4 (H) cm  Sponge Density:   coarse pores  Packing List: 1 x biochemical filter cotton (vacuum sealed).  Tips: Replace biological sponge every three months to ensure good filtration effect and growth of nitrifying bacteria.