The amazing clarifier in a cube! Just place in the pump basket - your pool will be crystal clear. Ne mess, no measuring, no worries. Non-toxic, biodegradable. MiraClear will keep your pool crystal clear for 30 days! Removes particulate matter down to 1 micron, removes disolved metals and can be used along with all pool and spa chemicals. Treats up to 30,000 gallons of water.