I blow each line for about 5 min make sure everything is out. I dont like tipping antefreeze into the lines, only ptraps. Even if there is a 5 drops I dont think it will damage any lines cuz there is room to expand. Same thing we do with sprinklers. Blow them out and good to go. How do you guys do your water pumps. On this one I disconnect one of the lines then blow it out. Its completely dry. Is there is a drain plug in those?
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