100% natural ingredients. Contains no chemicals, bacteria or other organic additives. Extremely effective in freshwater and saltwater aquariums and ponds. Improves and provides more stable water quality, removed chemicals, food residues, heavy metals, chlorine, ammonia and other pollutants, better plant growth, young fish grow faster, corals grow better, algae is prevented or disappears completely. Unlimited durability. 10 ml per 30 liters.