spoon059 wrote:
Maybe I am too stupid to understand... what is the benefit of immediately draining the antifreeze after running it through?
If your Pex lines are retaining the taste of the antifreeze, you need to replace your lines. They should not absorb, and if they are absorbing the taste of the antifreeze they are also absorbing bacteria from the water and will make you sick.
I leave the antifreeze in the lines as well. The way I look at it if you drain the antifreeze back out you introduce air and bacteria into the system.