Finest-Filters activated carbon impregnated foam provides excellent chemical filtration in aquarium and pond filters alike. This foam is impregnated with carbon, which will absorb chemical impurities out of the water, giving it a 'polish'. Carbon really does improve water clarity! This sheet is large - meaning you can cut several pads to fit your filter - depending on model.
Our filter foam is totally aquatic safe, and is not treated with any chemicals, so it is guaranteed to not harm your fish. We have been using this in our tanks for many years with great results.