MasterLine FilterMax is an innovative, high-quality filter medium that ensures optimum water quality in your aquarium. It efficiently removes pollutants, promotes biological balance and contributes to a healthy habitat for fish, shrimps and plant.MasterLine FilterMAX+ due to its high porosity, it supports nitrifying bacteria to break down toxic substances such as ammonia and nitrite+ it's a 100% natural filter material that does not require replacement, and can be used indefinitely+ it is colonized by beneficial bacteria regardless of the type of water that requires filtration: fresh water or salt water+ the shape of FilterMAX allows the entire volume of the filter to be used, but without affecting the water flow+ the 6-12 mm size of the filter media makes FilterMAX compatible with any filter system+ because the beneficial bacteria colonize the internal pores, after cleaning the filter, the risk of destabilizing the aquarium is non-existent