I tried it, thinking it was a good idea and was far from impressed. After using a few strips and not seeing changes in some of the levels, I went back to my old test kit. The strips gave me a 0 for CYA, even after adding 4lbs of stabilizer in a 13500 gal pool. Now I have to think about doing a partial drain to get the CYA down from 90. If the pool stays clear, I'll probably just leave it alone. Also, my ph never moved from 6.8, luckily that's an easy fix.