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The major component of automotive antifreeze can be broken down easily by organisms in a sewage treatment plant. If your home is connected to a sanitary sewer, antifreeze can be poured down the drain or flushed down the toilet. August 16th, 2004, 08:14 AM #8.
Drain all old antifreeze from the cooling system to remove any rust and deposits. Be sure and use an adequate drain pan, along with shop towels, oil dry and gloves to minimize the mess. Flush the system with a radiator cleaner and water to remove stubborn rust and corrosive deposits. Use an inexpensive flush and fill kit to make the job easier. Fill with 50-70% antifreeze and water mixture. A funnel should be used to prevent splashing, and a tester can be used to ensure proper mixture.