API Proper 8.2 Powder 200gmpH is the measure of acidity of water, on a scale ranging from 0 to 14. A pH of 0 is the most acidic, while a pH of 14 is the most alkaline. Water with a pH of 7.0 is considered “neutral”. Different geographies have different tap water conditions with different pH levels, while fish require a specific pH level to thrive. API PROPER pH 8.2 Freshwater Aquarium pH Stabilizer automatically sets and stabilizes the pH level in freshwater aquariums to 8.2 which is perfect for saltwater, brackish water, reef and African Cichlid aquariums. API PROPER pH 8.2 Freshwater Aquarium pH Stabilizer also removes toxic compounds from tap water such as chlorine, neutralizes chloramines, detoxifies heavy metals, and adds electrolytes, making tap water safe for fish. Use this aquarium treatment when setting up a new aquarium, adjusting pH, or changing water. pH in an aquarium can fluctuate due to fish waste, uneaten food and addition of tap water. It is recommended to test water for pH weekly.Automatically sets and stabilizes pH at 8.2. For saltwater, brackish and African cichlid aquariums. Use when setting up aquarium or changing water. No phosphates.