I love this site! It has been a big help as we plan for our new pool. One question I have had is about pipe size. I have noticed a number of posts that recommend 2 or 2 1/2 inch pipes. My PB uses 1 1/2 inch pipes. When I asked about it he sailed that the fittings are standard at 1 1/2 inches for most pools. His explanation was that larger pipe size won't matter if the joints and fittings are smaller. He offered to use 2 inch if I wanted but thought it was unnecessary and won't impact water flow. Could someone help me understand the importance of pipe size?