API Proper pH 7.5 Powder, 9.2 OZAPI PROPER pH 7. 5 automatically sets and stabilizes pH at 7. 5, and removes chlorine and detoxifies heavy metals. PROPER pH 7. 5 also contains electrolytes to reduce fish stress and boost overall health. pH is the measure of acidic or alkaline conditions in water, where a value of 7. 0 corresponds to a neutral pH, pH values above 7. 0 are considered alkaline, and pH values below 7. 0 are considered acidic. Different fish need different pH levels to