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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.
I'm an environmental engineer who works for a public water & sewer utility. I also have a septic tank, and I have designed septic systems in the past. You don't need to use Rid-X or any other related additive.It shouldn't hurt your system, but you are literally flushing money down the toilet. Not unless you are flushing industrial concentrations of chemicals down your toilet.hat said-if the product is labeled not safe for septic systems don't use it in a septic system. I should also add that, while I do use bleach sometimes, I am not in the habit of pouring gallons of it down the plumbing on a weakly basis.