Coolant suprise

Most municipal sewer districts allow small amounts (personal use) to be poured down the drain as it breaks down rapidly to harmless components.

Call your local sewer department for local info.

I probably would not pour it into a septic tank or cesspool. It can be landfilled at appropriate facilities..

That would be the city sanitary sewer system which is OK, not the storm sewer drain out in the street.

All your toilets, sink drains, and floor drains inside your house go to the sanitary sewer system, and it is ok to dispose of old coolant in those drains.

Tom

I put it in a 55 gallon drum I have in the basement, and save it for topping up the hydronic heating system in my house. I have about 100 gallons of

The previous owners, and most people who have these types of systems, put raw water in them. It turns black with time, but the corrosion isn't too bad, if you don't drain the system that often. Copper and even iron are relatively forgiving, as long as fresh oxygen never gets into the system. With the antifreeze I filled it with, I figure corrosion is just about halted. The coolant only comes into contact with black iron, brass and copper, so there isn't nearly the corrosion danger that there is in a modern automotive engine.

If you turn your antifreeze in to a legitimate recycling center, they purify the glycol, probably by distillation, put some more corrosion inhibitors in it, and resell it to you, or more likely to fleet buyers of recycled antifreeze.

Earle