Had another post on it last week wanted to start a new one. So was getting some green stuff on walls and bottom last week, I vacuumed Sunday and cleaned filter. My CYA is somewhere between 160-180 based on a 4:1 dilution and doing the test a couple times to see where the dot disappears.(40-45) My CYA should be a minimum of 15 based on that and its where have been keeping it. I got the FAS-DPD kit last week so I could be more accurate and I was traveling this week so I brought it to 19 before I left. My wife added bleach on Tuesday and Thursday to keep the FC numbers and I looked today and its still FC 19 CC 0. I used a 2:1 dilution with distilled to measure so I didn't have to use 38 drops of reagent. In any case the green is back but the CC is still zero. I thought that if the chlorine was actively killing algae like a bloom your CC would be high like over 1? In any case this is what my bottom looks like is it possible its dead algea? Pool is crystal clear but getting this stuff in it. Thoughts? Try a shock? What levels?View attachment 43272View attachment 43273