I love using the TFP method. I slammed my pool a month ago and I now have 0.5 OCLT on average with 0 CCs.
I maintain a CYA level of about 70 and my chlorine level is around 10-12. I do the DPD-FAS test twice a day and have just had to order new reagents due to using them so much.
I have a sand filter that I use and backflush around once a week.
My backyard in on the desert in Phoenix (South Mountain). My water was looking a little hazy, although I had no trouble seeing the bottom of the deep end of the pool. My numbers were all good. I decided to add a little "water clarifier" to the pool. It cleared up the pool overnight. When I backflushed the filter a bunch of darker water came out initially from the backflush port. I think that dust from the desert enters the pool and it's too fine for the sand filter to capture.
Is there any problem with adding a bit of clarifier now and then to "brighten" up the pool?