Utility Wonder 10-3011 One Quart Of Boiler Colloid Boiler Cleaner Liquid cleaner simultaneously cleans & conditions boilers & heating systems. Use for hot water or steam systems. It needs no draining or flushing. Benefits: Regular Use Keeps Your Boiler Clean Saves Fuel Prolongs The Life Of Your Boiler Contains No Petroleum Distillates Amount Required: Use One (1) Quart Of Boiler Colloid For Every 20 Gallons Of Water In The System. If Water Capacity Is Unknown, Use One Quart For Each 500 Square Feet Of Radiation Rating Of The Boiler Or For Every 120,000 BTU. Use This Amount For Cleaning And Maintaining The Boiler. ***NOTE*** Do NOT Use In Systems Containing Anti-Freeze. Replaces Utility Wonder 10-3010