Be aware, the one regulation most public pools have to abide by is that CYA cannot be over a certain level. I've heard as low as 30 in some places. I guess there is some research on kids gulping pool water and CYA ingestion making them sick. I'd try to stay in the ~30 range just to be safe. With using the clarifier and vacuuming to waste, remember, adding new water will continue to lower your CYA. I'd test the CYA every time you do a vacuum to waste and refill.
Edit, just looked it up and the CDC limit on CYA is 15. FYI