API® POND ACCU-CLEAR water clarifier works to establish and maintain crystal-clear pond water, quickly clearing murkiness and helping your water filter to function more efficiently. ACCU-CLEAR water clarifier works by causing tiny, suspended cloud particles in water to clump together, which then quickly fall to the bottom of your pond. Recommended for use with POND-ZYME™ SLUDGE DESTROYER™ bacterial cleaner or POND ECOFIX™ SLUDGE DESTROYER™ bacterial cleaner for unparalleled pond cleanliness.