Perfect replacement for Tetra Small Filter Cartridges S Size; works for 3~10 gallons small fish tank filters; Measures 4" x 2.2" (L x W), fits many brands of Small HOB filters. Please check compatibility before purchasing.
In a three-layer filtration design, double-layer microfiber cotton can effectively absorb solid impurities such as debris and fish waste, and the inner layer of activated carbon can absorb odor and discoloration, reduce fishy smell, improve yellow water, and improve water quality. Clearwater provides you with a better fish-viewing effect.
Convenient to replace and install, and even no need to get your hands or fingers wet
Replace the filter cartridge every 3 to 4 weeks if there is reduced water flow.
6/12 Pack – Continuous, high-efficiency, low-cost, replacement Refills