I have a hunch...SLAMMING requires, where possible, 24/7 filtering...its not exactly the chlorine that makes it clear...its the filtering.
When you wrote this, did you mean you're NOT filtering 24/7?
- just to be cleaear, there is absolutely no such thing as "too much filtration" - especially during a slam
Secondly, Cal hypo in and of itself is going to add particulate if you're already saturated in Calcium, I suspect.
SO -- run your fiter 24/7, backwash at 25% above clean pressure, use regular bleach (not splashless, it will foam) for a day or two and post up comparison pics so we can see the water. Do an OCLT tonight to see if youre losing much -- your daytime numbers don't necessarily mean much due to sun and cya level
question.
Seems to me its time to finish up this slam, so I'm sending ya the mojo
cheers to clear!