The aquarium cleaner is a powerful concentrate product enriched with probiotics for cleaning and maintaining aquariums. In many aquariums, biofilm formation causes dirt to lodge in the filter, the water to become murky and pathogenic germs to develop. PRODAY actively combats the biofilmâs binding s so the water is once again clear, clean and hygienic. Because of its neutral composition, PRODAY AQUARIUM CLEANER is completely harmless and can be safely used in all kinds of aquariums.