Last summer and this summer I noticed that my Chlorine level was diminishing quickly. I was thinking it might be my CYA level causing it. So I tested my CYA using my drop test kit (standard $20 kit from Walmart) that I just bought. It showed next to nothing for CYA (i.e. it was too low to give a reading). So I picked up 6lbs of 100% CYA stabilizer and broadcasted out through the deep end of my 24k gallon pool. I left the pump running all night and 24 hours later I tested it again. Too my surprise though I didn't show any change in reading.
So, is it that it can take a long time for the CYA to dissolve and change the water chemistry? Or could it be that my new test kit's CYA test was a dud? Or is it that the CYA tests in general are unreliable? Or anything else?