API REV1G 1 gal Revive!® Start Up/Clean Up is a multi-action product that removes phosphates (algae food), metals including copper and iron, scaling carbonates, organic debris and other contaminants that cause cloudy water. It is formulated for use on new pool startups, replaster / remodel / refills, spring openings, abandoned pools, severe algae cleanups and ongoing maintenance of all swimming pools.