I am getting a new skimmer installed as it's an old hydro baker leaking, also doing a refinish yet tbd. I would like to run new 2" pvc lines as the pool is 1-1/2" now. I will split the skimmer and main drain back to the pad but my question is do I go the expense and effort to change the returns to 2" line as there is a lot of concrete deck from each return. I'm reading About head loss etc. the existing returns are just a single 1-1/2" line to each of the 2 returns, not individual lines.
Should i run 2" and just reduce it to 1-1/2 existing return lines as close as I can get to the existing returns or would the flow be ok with 2" suction lines and 1-1/2 returns. I didn't plan on doing any major plumbing replacement but if I'm doing a new skimmer and after reading a lot here I'm second guessing what to do.
thanks for advise