Do you know why your CYA level has gone to 10ppm in the past few weeks? Is that a pool store test result?Thank you. Pool had only been opened for 12 days when I noticed initial and recent picture is only 1.5 old. During initial time it was opened by pb pool company to set up chemicals and then I worked with to dial back swg until we found what worked. That FC was at the initial swg setting ended up going from 60 to 40 to 20% over a couple of days to find sweet spot for my CYA.