I'm moving my pump & filter to the backside of our pool house- outdoors. The current inlet and outlet plumbing through the slab are pictured. My plan is to replace the 4 ball valves with pentair diverter valves, then bring the two 1 1/2 inch outlets into a 2 inch T (do the same for the inlet) so that my pluming to the pump --> filter --> heater will utilize the maximum diameter of each tool (2 inch PVC). I'm know plumber, but the current setup is bringing two 1 1/2 inch lines to a 1 1/2 inch T, it seems it would be better to bring the two 1 1/2 lines into something as large as possible to prevent bottlenecks. Does this make sense, will it make a difference?
A second question, do check valves reduce flow?
Thanks for your input.