Quick CYA level question. Is the 30-50 for a BBB pool just to help preserve the FC during the day or does it serve another purpose. I am currently at 25 and will add more when I have to next top off the pool so that it doesn't go too low, but I like the lower FC and shock levels (should I have to) that poolcalculator says that I need with the lower CYA level. I do not lose FC very quickly and was wondering if I should still be at a 30-50ppm of CYA.