OK - didn't take long to move the pump to bank and run directly into the manifold - everything is heading down into the water now. With the heat of the pump, I expect all to be OK as far as freezing now. I put a plastic cover over it and left one side open for the manifold. I figure I can change it back in the summer - just one more prepping job when winter comes each year.
Now for the new problem - I think it is anyway.
I am currently running 3 diffusers and plan to use just the shallowest one thru the winter. I just closed off the other two for a quick check and hear my pump clearly go from an "idle" to definitely building back pressure with only one diffuser in use.
Is this an issue? Should I do something to vent some pressure when I go to one diffuser? If so, what is the best method? I can just pull a line off and use the manifold valve to bleed it if that is acceptable?
