Proper pH 6.5 sets and stabilizes pH to 6.5 and also removes chlorine, neutralizes chloramines, adds electrolytes and detoxifies heavy metals in freshwater aquariums. Perfect for use in aquariums containing soft water species, including tetras, discus, rasboras and angelfish. Use when setting up a new aquarium, adjusting pH in an established aquarium and changing water. Not for use in aquariums containing live plants. Treats up to 218 gallons.