Tetra Phosphate Minus is an effective aquarium water treatment product specially developed to naturally reduce high phosphate (PO4) levels. The use of this product prevents the growth of unwanted plant species, which contributes to clear and clean aquarium water. Tetra Phosphate Minus is both gentle and safe for all aquarium inhabitants, so it can be used without hesitation. The product is easy to use, making it a practical solution for aquarium owners who want to improve the water quality in their freshwater aquarium. Reduces high phosphate levels (PO4) in a natural way. Prevents unwanted plant growth without clouding the water. Safe for all aquarium inhabitants.