My 10,000 gallon above ground has had a leaky main drain ball valve for the last two seasons, but I think I may need to replace it finally. Over the last few days, the pump has been losing prime and as best as I can tell, this is the most obvious culprit where air could be getting in.
How tricky of a repair would this be for someone with no plumbing experience? Since there's no way to close the main valve itself, is this sort of repair possible (by me or a professional) without draining the pool?
Here's a shot of valve in question