Phosphate is bad for swimming pools. It is constantly added through source water, ground runoff or rain. When levels get too high, it can create dull, cloudy or hazy water conditions. Plus, if pH and calcium hardness is high, it can contribute to the formation of harmful calcium phosphate scale on surfaces and equipment. This is especially problematic for saltwater pools. BioGuard Pool Juice ZERO is a remedy that quickly lowers phosphate to acceptable levels in just 24 hours.