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Ethyl from propyl..... how to differentiate.
I was working on a Solar thermal evac tube system yesterday. The system pressure was down around 10 psi. So I wanted to add some more pressure into the system and bring it up to 25 psi. (prv is set to pop at 45psi.)
I added about a 2 gallons of solar propylene glycol.
In removing a 1/2 gallon on the other side of the system it certainly looks like the original installer used Ethylene glycol in the system.
How do you tell the difference between the toxic and non toxic stuff?