Risks of swimming with FC above 4?

Apr 29, 2021
10
Houston, TX
I've been using TFP methodology for 4 or 5 months and it's going well. My CYA was on high end due to almost a year of the pool guy using pucks. It's gradually coming down (currently around 50) as it's diluted with rain and I drain off some water after heavy rains. According to the pool math app, my target FC range is 4 - 8 though I've been keeping it around 3 - 4.

I often see recommendations that free chlorine should be somewhere between 1 - 4 ppm and it can be dangerous to swim if too high. Are there issues with chlorine levels of 6 - 8? Do the guidance and warnings not account for CYA levels and assume it's low or 0?
 

V___25

Gold Supporter
May 30, 2020
237
Central PA
Pool Size
24000
Surface
Vinyl
Chlorine
Liquid Chlorine
FC of 1-3 is a pool store recommendation and generally not a good idea. 4 is the really the lowest FC should ever be in TFP world. At a CYA of 50, your target FC is 6-8 according to the CYA/FC chart. It's safe to swim up to SLAM levels.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
29,710
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
I often see recommendations that free chlorine should be somewhere between 1 - 4 ppm and it can be dangerous to swim if too high. Are there issues with chlorine levels of 6 - 8? Do the guidance and warnings not account for CYA levels and assume it's low or 0?

Correct. The 1-4 ppm chlorine guidelines are without any CYA in the water.

Read CYA Chlorine Relationship - Further Reading to understand the buffering CYA has on chlorine and the low amount of active chlorine that the proper FC/CYA ratio has.
 
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