My current setup has 3 3way valves, operating my suction cleaner, main drain, and skimmer. They are old, hard to turn, and I am pretty sure leaking air into my system. I want to replace them, but I am having a hard time convincing myself that they are even needed. Someone please tell me why to use these expensive complex valves, instead of 3 individual inline ball valves? They would seem to give me better control of what water flows where, and are WAY cheaper. So can someone tell me why I shouldn't use plain old ball valves?