I have a dual leak question/issue/problem that I could use some advice on.
1. Multiport valve has water leaking out the top I believe. It is a substantial amount of water too. I believe it is coming out from the handle area and dripping down. Not sure if I should take apart and try to diagnose then buy parts, absolutely call a pro, or just buy a new valve or just valve cover and assembly. The washer or plate under the handle has a lip and that is always full of water and I can see streaks and drips below it.
2. I've had a usually slow leak issue for a long time. It varies on how strong the leak is. Basically water is oftentimes draining out slowly from the backwash pipe. After I backwash/rince/waste the leak is usually at its strongest. Usually I'm losing a couple inches a day. Other times I'm lucky and it slows to a dribble. I looked into it once and came away believing that was a bad washer, but I'd prefer a more educated opinion. I also figured since I have to do repair now it would be great if I could eliminate both problems at once.
I could use some help with the best course of action. I live in a fairly remote place where any parts will be either hard to get or expensive. I'm willing to spend but I want to make sure I'm not just throwing darts at the problem. I appreciate any help or advice.
17,500 gallon pool
Roughly 18' long, 12' wide, and 5'5" deep. It's asymmetrical so that's far from exact and I'm not using my notes for those measurements.
Sta Rite multiport valve wc112-148
Not sure how many gallons the filter is or if it is sand or DE as it came this way when I bought it.
Bonus question - How hard would it be to change the sand/de? It's been over 6 years and I imagine the whole system will run more smoothly if I'm able to do this.