I don't really know what is going on. Our water is very hard and in the past it wasn't uncommon to see 250 for alkalinity when I first fill. I would usually use a tablespoon of muratic acid and it would bring it down in a minute to where I could balance everything out with my spa down.
Today I filled up for the first time since spring. I went through 3/4 of a cup of muratic acid and 1/4 cup of spa down and got it to 119. I just came home 4 hours later and it is testing at 285. Anyone know what is going on here or what I can try?