Hi all, I am a brand new spa owner. I have been using the BBB method with my pool successfully for three years. My spa is 300gal, completely independent of pool with an ozonator that can not be shut off. I bought it used. I used spa system flush dumped the water and started with fresh water and a new filter. My CH is 100, my TA is 100 (I plan to lower), my PH is 7.8 and my FC has never reached 0. My problem is that even though my chlorine is what I would expect for instance this morning at 7 AM I brought the FC from 3 to 9, when I checked it at 6PM it was 4.5. The filter and ozonator ran for two hours during that time with no bathers. Each time I have checked the FC today I have had a CC of 1. Yesterday with the new water it was 0. By the way my CYA is still less than 30. If I forgot something I apologize! Any in site would be great. I have the filter running constantly now. Thank you!!