FC 5ppm, CC 0, pH 7.4, TA 90, CYA 35, CH 290, current pool temp 69F (the warmest so far this year)
I started serious work on this 15,000 gallon pool about 5 weeks ago (based on lots of TFP advice! Thanks!). The CYA started at about 100. I drained and filled till I got to 35ppm. I then SLAM'd the pool and passed the OCLT test about 3 weeks ago. The CH was low so I added Calcium Chloride till I got it up to 290ppm. For a CYA of 35ppm, I have been keeping the FC between 4 and 6ppm. And I have been keeping the pH between 7.4 and 7.6.
I am using the same pool sweep and bag for the last year (Polaris 360). SLAMing the pool cleaned most of the algae in the bag but not all of it. I thought the rest would go away over time. There is no sign of algae anywhere else. Any ideas? I am installing a new bag so I can easily tell new algae quickly.