6Pcs Aquarium Filter Cotton, 135 x 55mm high density cotton Carbon Cartridge Replacement Wall Mounted Fish Tank Water Cleaning Supplies

【Applications】The front filter cotton thick layer captures excess substances and activated carbon, absorbs heavy metals etc., and provides clean and clear water. 【Easy to Replace】The filter cotton easy-to-use filter core, simply rinse with cold water to remove the toner and insert it into the filter slot, and it can be replaced within a few seconds. 【High Quality Materials】The fish tank filter sponge is made of cotton, which has good water absorption, good air permeability, strong cotton texture and soft hand feeling. 【Resuable】The aquarium filter mat is easy to clean, and you can use the fish and rock aquarium filters repeatedly. Help you save materials. 【Size Information】The aquarium sponge filter135 x 55mm, please replace the filter core as needed every 2 to 4 weeks. Suitable for sea water tanks, fresh water tanks, and aquatic tanks.