I recently had my pool covered (solar cover) for a week during a stretch of bad weather. Uncovered it a couple of days ago, of course TC was low. Ran the pump and filter as well as the SWG. At the end of the first day, I also checked CYA and the fluid in the tube was absolutely clear. Tested again. Same result. Added about a half-cup of CYA granules (I try to add in small increments because my pool is small) and tested the next day, and the day after. Added another 1/4 cup today. Still clear. I should be getting some result by now, yes? I am getting worried about overtreatment at this point.
My CYA has always been in the 50-70 range, and I'm not sure why it would drop so low over 6 days.
The only other thing that has changed is that I opened a new bottle of R-7065, the CYA test standard. Could it be a bad batch?
TC is rising, now at 3, pH is consistent at 7.8 and water is clear.
Thanks for your help and advice.