Pool Math App Question


New member
May 22, 2021
Sellersburg Indiana
From what I’ve read on here, my FC needs to be at 7.5% of my CYA level to effectively sanitize pool water. When I put a CYA level of 60, the app suggests 7ppm as my target FC level. Based on the 7.5% rule my FC needs to be at least at 4.5ppm. I get a little buffer but is the rest of my levels are good, so I really need to raise my FC to 7ppm.

FC - 6
PH - 7.6
CYA- 60
TA- 70


Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
Pool Size
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Your FC drops during the day, until you replenish it with liquid chlorine each evening. The Target range is based around a typical loss each day such that you do not drop below minimum prior to adding your liquid chlorine, each day.
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