¡Look at (and READ) the pink stuff jug!
On the advice of a friend that used to be a product engineer for a major OE chemical supplier, I have started reading the jugs of RV anti-freeze that I have. The old ones were straight Propylene ...
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The newer ones have giant lettering that say SAFE, but do not say what they are safe for....
I always interpreted SAFE to mean that the RV antifreeze was safe for the pipes, valves and tanks, not for a person to drink. Always flush in the spring and I use a little bleach to clean out any stuff in there that should not be in the spring. And then flush a few times.
