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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.
The water is turned off. Then, flush the toilet. Use a plunger, if necessary, to remove any remaining liquid from the toilet bowl. Pour 1 cup of baking soda down the toilet drain. Heat 2 cups of white vinegar inside a microwave oven or on a stove. The vinegar does not need to be boiling hot. Pour the vinegar down the toilet drain. A chemical reaction occurs, and some residue from the reaction may bubble up out of the toilet drain.