I have one of the good test kits, and strips also, although both were purchased about a year ago.
My CYA consistently tested high last year (80-100), but I made do, and every day I swam I tried to dump out at least a hundred buckets of water. I had to refill for a while upon opening.
My first test of the water (with the good test kit) showed negligible CYA. Because of that, I put in two pounds of pool store shock, which I bought before discovering this site and had avoided because of the CYA issue.
A few hours later, I checked the water again. CYA of 100 according to the good test kit...then I used a strip, and the strip showed it to be in the good range.
Does anyone know what might be causing these wildly fluctuating results? The test kits have been stored in a cool, dark place.
Right now my FC is ~ 5 and my CC is ~ 1.5. How should I continue to shock the pool?
Thanks in advance!