I should have done a full test on my pool when we opened, but all looked good, and, well...here goes:
CH: 120 (yikes!)
CYA: 20-30 (I could just call it 25. It's hard to tell. Did the test a few times. We've had a lot of rain and we vacuumed to waste recently so it makes sense that it's low).
Sooo clearly I need to increase CH. It's been a while since I've had to increase CH. What do you recommend I get? I know walmart sells some stuff, just not sure if that's best or not. And can we swim pretty soon after? I have a friends coming to swim tomorrow morning.
Thank you so much! Pool looks great, though, aside from what looked like something happening to the bottom of it (leaching or something?), which led me to do the full test and become concerned about CH. No algae or anything, either, by the way.