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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.
Add Plumber's Antifreeze. With the water out, it's time to add antifreeze. Wear safety glasses in case it splashes. Always use non-toxic antifreeze rated for plumbing systems. Pour it into the tank -- not the bowl. Hold down the flush handle to flush the antifreeze out into the bowl and drain the system.