I understand that you can run the pump in freezing temps and prevent freezing but I still have a question. I have a waterslide that is fed by a pvc line with an inline valve. The valve is about 4 feet off the ground directly below the slide. (this is how you turn the water onto the slide)
So what should be done with this? Can't this pipe freeze with the water valve off or is there sufficient movement of the water since there is pressure up against the closed valve?