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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.
Typical recommendations for flush intervals are 2 years/30,000 miles for conventional antifreeze and 5 years/100,000-150,000 for long-life antifreeze (many of us in the field find the long-life interval to be overly optimistic).