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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.
1 Flush the toilet and the water backs up into the bathtub or shower drains. 2  Run the sink closest to the toilet for a minute and the toilet bubbles or the water level in the toilet rises.  Use your washing machine and the toilet overflows or water backs up into the tub or shower.