Wow there are a lot of talented people on this forum willing to help. This is wonderful. I am trying to understand pipe sizing and other pipe issues. I am gc'ing my pool (as to be able to afford it) and my helper said he always does 2" suction with 1.5" returns. I can get free 2" pipe and would like to use all 2". Is this considered upsizing? My pool will be about 39' long 15 to 20' wide, 8.5' to 3' deep. My guess is about 29,000 gallons. I plan on a VS pump. Pentair CCP 420 filter. Also I will have a slide, a small fountain and 2 laminar fountains, not all running at the same time. Ok, next question. In Oklahoma, they seem to put the plumbing in the pool shell. My concern is that IF I ever have a plumbing problem, fixing it becomes very difficult. I just assumed the plumbing would be outside the shell and under the deck. Thoughts? Thanks again for all the help.