I've been a pool owner since me and the wife bought this house in Nov 1995. We've pretty much seen it all, I'm a regular handyman dealing with the mechanics of the pool. Have replaced 2-3 pumps, reworked plumbing,etc.
Pool - 16x32 feet inground, 19,000 gallons. Diving board at end, steps at the other end (outside of the 16x32). Vinyl lined, on 2nd liner in 25 years - this one was put in 2 summers ago when I ripped a hole with the brush. Our water supply is from our well - normal pH of the untreated water is 6.7. 1.5 horsepower Hayward Superpump, 300 pound Hayward sand filter, Claritec, and Hayward chlorine dispenser. Do have a Hayward 250K BTU propane pool heater, but it is OOC right now and I can't afford the propane to run it even if it wasn't. Lots of trees / shade. Youngville NC area (about 20 miles North Northeast of Raleigh). If I had to do it again - I'd get a heatpump poolheater.
Biggest vexing problem - getting the winter pool cover off when opening the pool without dumping lots of **** into the pool. This usually takes a week or 2 to get cleared up. CYA is never added to this pool - whatever is in the chlorine tablets is plenty considering our shade.