dinotec pH-Stabil increases the acid capacity (carbonate hardness) in swimming pool water. Waters with a low acid capacity (carbonate hardness) have a low buffer capacity only and have little resistance to the influences that change the pH level, i.e. the pH value is instable and subject to large variations. A carbonate hardness of <5 dKH (<1.7 mmol acid capacity) has a negative effect on the flocculation and can lead to clouding of the water.