I know liquid chlorine is preferred, but the pool store was running low last time I was there. I've had my pool at SLAM level for 3 weeks now so I'm going through a lot of chlorine, and I had to supplement with granular shock. My local store carries BioGuard Burnout 3 which is 57.8%. Pool Math has 53% and 65% so I can estimate by going in between, but would it be possible to add a choice in the drop-down for 58%?

