My pool has been burning through some chlorine the last two days and the deep end was a touch cloudy, so I did the OCLT test last night and lost 1-1.5 FC. So I figured I should start a SLAM. I tested this afternoon
According to cya I needed to bring up to 20. So I added 2 jugs of 8.25% bleach. Waited 45 mins and retested. Halfway through the test (20 drops) the sample turned dark grey or black. I kept adding drops up to 40 and no change in color. It was bright magenta to start. Dpd powder is a few years old. Is my powder bad? Also tested cya after bleach and it said 40. Does the bleach affect the cya test? If not what can account for this? I need a solid cya number so I know what bleach to add. Please help and thanks for any replies.