That should work. Just as long as you fill the system with WW it'll work.I did a test bay 2 nights ago on my farthest #10 bay has hit 26 degrees and 27 degrees at night since no freeze up. You guys up north familiar with WW fluid tell me if I am wrong on this process to double check. First I disconected the supply hose to pump turned it on for 20 seconds with no supply water to purge then sucked a gallon of -20 washer fluid turned pump on until it came out in bay a very long run. I left the spray wand and tip still attached. Was thinking about doing several more bays and leaving them like this through the deep freeze we gonna have this weekend 10 & 12 degrees at night and 28 for high during day. I just don't want lines & swivels to all freeze and have a genuine mess. I want to do this to save on weeping water where I am water can be pricey. Thanks Thomas