Hello I am new to owning a pool and am confused at what does what here. It is a pool and jacuzzi with lots of valves. Ok 3 but I have no idea what they do. I hired a pool guy for the first few weeks since house was 2 months in escrow and they failed to maintain it. Well I fired the pool guy because it was one reason after another why it still had algae. Anyways I have a nice sparkling pool now for the most part but I have no idea when or what these valves do. Anyone know which does what?