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It could be a broken sand filter lateral and filter media is getting into the pool.
Here in NC the tank depth is determined by maximum trench depth for a gravity system. Soil conditions, how deep rock is located or water table...
How about a tee handle?
Take the handle off. Cut the stop off the end of the handle or bend it up. Then put the handle back on. It should work pointing in...
Maybe there is a cross flow at a single handle faucet? Maybe the cartridge in the new valve was not pushed all the way into the valve etc. Did...
Here is a Delta Conversion Kit - 1500 Series to 17 Series
Make sure all the valves are fully open. Low flow might be because a valve is partly closed or piping could be undersized etc. Sounds like you...
Here is a better example:
The first 21 seconds of this animation shows a deep well with a single pipe jet system:
You are so close on it I can't tell for sure. . . . That looks like part of the isolator valve; it might be one of the flush ports. That type of...
You can just screw them on
Here is another with a poppet type vacuum breaker
Here is an example of a built in backflow preventer
If they are original to the home from 1959, you probably don't have any type of backflow preventer.
If they are not already built in you can just screw one on each hose bibb....