I have had my pool for three years now. I have been fighting pH constantly. It is constantly rising and I am adding MA several times a week. A gallon at a time usually. I get it in range and the next time I check it it is over 8. Often with 6-8 drops acid demand. I do have a waterfall that runs during the day.
Over the last year I have had white scaly patches come up. On the floor of the pool mainly. However there is a white buildup on the tile above the water surface on the side of the pool that gets most od the sun. (The pool is open to sulight all day. No shading at all)
Earlier this year I had my SWG go out and I didnt catch it. Pool looked horrible. Green with tadpoles everywhere. Got it cleared up over 4-5 days. Now I have black dots in areas throughout the pool.
Lastly I have had several times where the patio furniture has wound up in the pool, and caused rust stains on the plaster where it sat before we got it out.