4th season with this pool. Past 3 years I would open, SLAM for 2 days and CC would go down to 0. This year I am on day 6 and my CC wont go below 0.6. Pool pump I've been running about 16 hours/day. Overnight FC loss has been around 1.5. Water is clear. Slight hint of chlorine smell. Closed the pool with a CYA of 90 and opened with 50. Tested water for ammonia with aquarium kit and came back between 0.0 and 0.25. Probably closer to .10ppm.
Will I ever get that last 0.6 of CC out? How long to keep SLAMing? Any other chemicals to try and get rid of CC? Any insight would be appreciated.