I've been slowly raising my FC since using the TFP method from about 2.5 to 6. I've also been maintaining TA of 80 and pH of 7.5. I was a bit hesitant to raise the FC that high thinking the pool water would taste yuck and sting our eyes. But nope.
The pool clarity has never been better. I mean, there are virtually no visible particles floating in the water even with the pool LEDs on at night.
To that, the other week I measured CYA of about 60 (aiming for 80). Pool math told me to add just over 1Kg of CYA to the pool. I've checked again today and it is still around 60. The FC level is now 6.5, and wondering why the CYA hasn't come up? Should I add another 1Kg of CYA, or perhaps aim for 70 and lower FC? Could recent rain and water top ups diluted the CYA?
On another note, is pH of 7.5 a bit low? The CSI in pool math really prefers 7.7 and above but my instinct (and the quality of the pool water) tells me to keep it at that level. I'm using about 5L of acid a month to keep it at that level (pool is almost a year old).