I am in the process of getting a ig pool refinished and adding a new skimmer as my hydro baker is leaking I believe. I have replummed above ground at equipment deck with 2" pic when I put in a variable speed pump last year but the rest of the plumbing in ground is 1-1/2. So here's my question when I have new skimmer I'm thinking of having 2 separate lines one from skimmer and one from main drain with valves at deck. I'm thinking of replumbing the suction side to 2" pvc while there here, is it worth it with the returns 1-1/2. I also am thinking about having another return put in as the original design sucks where the returns are now. There isn't a big expense to add that additional return. The existing returns are under a concrete deck so changing those to 2" could be a major job.
Any advise please.