Ok I have vertical pipe going to roof panels this branches off with valve to bypass back to the pool.
I was going to install a vacuum relief valve about 5' above that branch leading to the panels.
I also have a pressure relief valve where does that go in the system?
I assume I need 1 or 2 back flow preventors is the system.
One on the up pipe ?
another on the feed back to the pool.
your input appreciated.