Similar set up 60+ years old. Everybody loves the old (non-restrictive) shower head and the soft lake water. Always just gravity drained and left the valves open. Once, about 30 years ago, I had a winter split in the 24" vertical pipe that runs from the valves to the shower head. Taught my daughter how to solder in a patch and all OK again, but I never could figure out why we had a split in the first place in a drained vertical pipe.
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