Function: Bacteria can be quite efficient with filters. Pore ​​structure can be a perfect reproductive bed for nitrification bacteria and excellent water . This product can be used with various filters, place in the right position on the filter, small aquariums, large aquariums, carp pools and all kinds of fish is very suitable for all kinds of fish . The aquarium filter environment is suitable for fresh water and sea water tanks. PH is neutral. It will be a great help to restore natural water quality and provide the living environment for your fish. . Increases the ability to carry hydrogen molecules and increases the oxygen content in the water. Strong filterability. It can be used again and again after cleaning. And strong filterability can balance water quality and reduce the number of dead fish. Ammonia, ammonium nitrite, hydrogen sulfide and other heavy metal substances can break. . [Our warranty] We provide 100 % and 30 -day warranty due to quality problems. You can buy it ly.