I got to try a new way of emptying a large waterlogged water pressure
There's no bladder, and I empty it just by opening the drain and letting
the water glug out, which takes about 24 hours after it falls to zero
Putting a twisty-tie end in the faucet sped that up to about 6 hours,
by shaping the glugs to more efficient large ones.
The new way, a drill pump sucking the water out, shortened it to a
half hour. On the other hand, you had to be present to do it.
After it goes to glugs, pump as much water out as you can (about a
minute of pumping); then undo the hose and let a huge suck of air
pull into the tank; then repeat the drill pumping. That makes it
drain in about half-gallon glugs, rather than dribbles.
So anyway, that idea worked, more or less. I have to do it once a year,
not a real problem.
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