As the title states, starting build next week and the steel guy asked me if I want him to use 2.5" or 3" suction from the both the pool and spa main drain to the pump? We initially planned on using 2.5" suction lines and 2" return lines, but would it be worth the extra money for the larger pipes to save on the effort of the pump? The pump is a Pentair Intelliflo (011018) and it is a relatively simple design with the only water features being two bubblers on the sun shelf. Thanks geniuses!