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The Flow-Aid System Descaler Kit has been designed to work with Tankless Water Heaters that provide 3/4" hot and cold service connections. Flow-Aide System Descaler is NSF approved and safe to dispose of in drains. RECOMMENDED USES: Ice Machines Humidifiers Water Heaters Boilers Heat Exchangers Chillers Vacuum Pumps Condensers Evaporators Tanks Potable Waterlines Water Operated Equipment The pump is 500 GPH.