Feature: Activated Carbon Impregnated Filter Pad Effectively Traps Large Particles, Removes Discoloration, Odor, Pollutants, And Harmful Chemical To Keep Your Aquarium Crystal Clear Diy Cut-To-Fit Filter Pad, Good To Use In Freshwater And Saltwater Aquariums. Works With All Filters: Canister, Hang-On Filter, Wet/Dry, Pond Filters, Diy Filters To Ensure Optimum Performance, Replace The Filter Pad Every Three To Four Weeks Depending On Waste Load Of The Fish Tank Includes: 1 Pack Of Filter Pad.

Each Is Of 3/8'' To 1/2'' Thick, Thickness Measured Dry Before Packing And Varies By Batch Includes: 1 Piece Of Filter Pad