Hi, Peggy,

Yes, I would keep it at 15+ 'til it holds overnight. I think you've cleared the algae but the high Cl hurts nothing and will only help clear your pool.

Your pump and filter capacity might be the reason it's going so slowly, but keep that pump running and a clean filter in there 'til your water is clear.

Even tho Ben's table doesn't say this, you might consider dosage to reach 18-20ppm. My pool stayed really cloudy because I was hovering around 12-14ppm for a few days so I boosted it just a little extra and it cleared in 24 hours. The main ingredient now is to STAY THE COURSE. You're probably closer than you think to nice, clear water.