Hi there,
The CYA in my pool dropped from 90 on August 24th to <30 yesterday/today. I took over care of the family pool recently but was away from Aug 26th-Sep 11th.
I had just started slamming the pool before I left and asked my mom to continue for me, but she did not have time to vacuum the pool daily (which it needed- there was a bunch of sludge on the bottom), so I told my mom to just keep the chlorine at the normal recommendation with the poolmath app instead of at SLAM levels.
I got back yesterday and the CYA level was <30. I repeated the test this morning and got the same— I can see the black dot even when the column is entirely full. I put in enough chlorine to reach SLAM level last night and this morning my FC was =<1.0 ppm, so this fits with the lack of CYA.
My mom did not excessively back wash while I was away and she did not do any partial drains.
How is it possible that the CYA dropped?
The CYA in my pool dropped from 90 on August 24th to <30 yesterday/today. I took over care of the family pool recently but was away from Aug 26th-Sep 11th.
I had just started slamming the pool before I left and asked my mom to continue for me, but she did not have time to vacuum the pool daily (which it needed- there was a bunch of sludge on the bottom), so I told my mom to just keep the chlorine at the normal recommendation with the poolmath app instead of at SLAM levels.
I got back yesterday and the CYA level was <30. I repeated the test this morning and got the same— I can see the black dot even when the column is entirely full. I put in enough chlorine to reach SLAM level last night and this morning my FC was =<1.0 ppm, so this fits with the lack of CYA.
My mom did not excessively back wash while I was away and she did not do any partial drains.
How is it possible that the CYA dropped?