So they are supposed to be pouring the concrete collar around bottom of pool walls today and pour the walk in steps(to be liner covered). They say tomorrow they will start running the plumbing. What should i be on the lookout for as to plumbing. Ive told them I want 2" lines instead of std 1.5". I really don't know what is the "right way" to do it, so any tips on what to look for and insist on? We will have 2 skimmers, 2 main drains, 4 returns, 2 laminar deck jets, plus a water feature return, propane heater, 27" hayward sand filter, 40k hayward salt generator, and 1.5 single speed Hayward super pump. Thanks in advance for your help.