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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 only things that should be flushed down the toilet are wastewater and toilet paper. Avoid Hazardous Chemicals. To avoid disrupting or permanently damaging your septic system, do not use it to dispose of hazardous household chemicals.he Septic Tank. Household wastewater first flows into the septic tank where it should stay for at least a day. In the tank, heavy solids in the wastewater settle to the bottom forming a layer of sludge, while grease and light solids float to the top forming a layer of scum.