Safe Chlorine Level Before Entering Pool


Well-known member
May 27, 2011
Will someone please tell me why the recommended chlorine level should be at a minimum of 2 to 4 before entering pool. I have seen this on labels and read about it from pool managers. Is it technically correct or just opinions. THANKS


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
Aug 10, 2012
Because they either are not aware of or refuse to acknowledge the chemical buffering and bonding relationship between cyanuric acid and chlorine. It is entirely incorrect on all counts.

Chlorine levels must be maintained based on CYA levels and the [FC/CYA][/FC/CYA]. There are links at the bottom that explain the science behind it.


TFP Expert
LifeTime Supporter
Jan 6, 2010
San Dimas, CA (LA County)
It is technically correct if the water is straight out of the tap. Then it's high enough to kill viruses and bacteria. Once you start buffering the chlorine with CYA, it no longer holds.

If you have a science background, this thread explains it. The part you want is right at the beginning. Lucky you. Pool Water Chemistry