MasterLine Purity cleans the water by absorbing the very fine impurities filter medium complementary to biological filter media. The filter medium increases the oxygen concentration in the aquarium and contributes to a stronger pearling effect.MasterLine Purity+ prevents the formation of ammonia and nitrite by absorbing organic matter+ contributes to increasing the oxygen concentration and intensifies the pearling effect+ clears the water in the aquarium and prevents the formation of algae+ reduces the concentration of organic matter dissolved in water+ after loading with organic matter, it can be regenerated, which allows a longer use+ perfectly compatible with MasterLine Zip Bag+ dosage: 100 ml per 100 l of aquarium water