Professional media for lowering pH level of aquarium water. The PH of aquarium water determines biological balance of the aquarium, so it should be as close to natural as it is possible. Species of fish from Amazon river, where the pH of the water is 5.5-6.5, habitat prefer slightly acidic pH. Clearly, for some fish species, tap water requires a lowering of pH. AF Minus pH grants it in a quick and easy way. The optimal pH provides solid ground for reproduction and affects positively overall condition of fish. Perfect conditions obtained thanks to AF pH Minus allow to avoid dangerous alkaline disease. No phosphate content.