PhosLocker DUAL offers the same reliable phosphate removal and minimal clouding in pool from low to medium phosphate loads, while also combining innovative phosphate-binding with cyanuric acid biodegrading technology. This unique formula not only reduces phosphates but also helps control cyanuric acid buildup through a natural biodegrading process. It can remove up to 2,000 ppb of phosphates in a 10,000-gallon pool. PhosLocker Dual not only removes phosphates but also helps reduce cyanuric acid buildup naturally, keeping pool water balanced and clear.