Dazzle Phos Cleanse - 1LA healthier, more natural way to help control algae. Super concentrated formula removes phosphates from pool water. Use initially to remove high levels of phosphates levels in excess of 300 ppb. By removing phosphates (fertilizer), you starve algae, allowing approved sanitizers to easily kill them. One week after addition of Dazzle Phos Cleanse Plus, commence weekly maintenance applications of Dazzle Assure to keep phosphate levels low and water