Originally Posted by 5picker
Maybe YOURS but not everyone's and not enough to be giving general advice that opening the low point drains is not needed when adding antifreeze.
Here is what 80%+ of people have for low point drains.
There is no way to get antifreeze in these exposed pipes unless you open them.
If you don't open your low point drains during warm season (and why would you) then antifreeze will be trapped in them from the last winterization. I think that's what he's experiencing.