Pool Math Recommending unsafe Chlorine Level

[GoldCountryPool]

I am finishing the SLAM process (stupid algae) and am working at getting the levels back to safe. Right now I have free chlorine of 14 ppm and CYA of 45. The pool math app is recommending getting the level down to 6.0 ppm ....which is still above the hazardous level of 5 ppm.

did I miss something in the vast amounts of information on this site or should I ignore the app and just aim for 3 ppm?

All other levels are in the safe/acceptable range.

 

[dfwnoob]

What is a "hazardous range"? FC level is a function of your CYA level, and your CYA is 50 (it needs to be rounded up). The target range for liquid chlorine with a CYA level of 50 is 6-8.

Any FC level up to SLAM level is considered safe for swimming.

 

[GoldCountryPool]

What is a "hazardous range"? FC level is a function of your CYA level, and your CYA is 50 (it needs to be rounded up). The target range for liquid chlorine with a CYA level of 50 is 6-8.

Any FC level up to SLAM level is considered safe for swimming.

CDC reporting 5 ppm chlorine is considered hazardous. But good to know that I don't have to get it that low since the last time it got that low, the algae came out in full force.

 

[DrewLG]

The pool math app is recommending getting the level down to 6.0 ppm ....which is still above the hazardous level of 5 ppm.

did I miss something in the vast amounts of information on this site

This comes up periodically. The short answer is that, yes, you missed something: The 5ppm level that you call "hazardous" would only be hazardous in a pool with no CYA.

Here's a detailed explanation I wrote in response to someone else who asked a similar question: Too High Chlorine?

 

[Newdude]

CDC reporting 5 ppm chlorine is considered hazardous.

They don't factor the CYA/FC relationship. Tap water with 0 CYA and 3+ FC is harsh.

FC/CYA Levels

 

[GoldCountryPool]

thanks DrewLG for linking it.

thanks also Newdude and dfwnoob.