Pool Math - under FC, there is no option for 70% Cal-Hypo under Sanitizer


Gold Supporter
May 20, 2020
Neenah, Wisconsin
It goes from 65% and skips to 73%, can you please add 70% as an available option.
This seems to be a bit common as there isn’t much of a standard in cal hypo percentages that I’ve seen.

I have some 50% cal hypo that I mark as 48% in the app. I figure I’d rather be a little higher than target than lower, but it would be nice to be able to add it more precisely like we can with bleach percentages.


Well-known member
Sep 2, 2010
Montreal, QC, Canada
Programmatically this is a no brainer to add, and it’s even a bigger jump for me, with my 70% I have to use 65% or 73% calculations, it becomes even more significant when I’m trying to SLAM when my CYA is at 70 and I need a FC of 28.


Gold Supporter
May 27, 2019
Houston, TX
Why not program it like the bleach, where you can input your % Cal Hypo? I like this in the bleach, because I test each bottle now for degradation.