Is FC 14 too high to swim in?

[surfhawaii]

New to SWG and have kinda been chasing my tail with up and down chlorine levels (we're in 'winter' here in Hawaii with clouds and rain many days so sun not as intense). I had to shock it some time ago and put 'sanitizer output%' level at max but have been lowering it last few days to get chlorine levels back to normal because FC has been creeping up (I just have not figured out the right % level yet for the situation). Today's FC test shows 14. Finally just put SWG to 0% today but am curious, is FC 14 too high to swim in? I 'closed' the pool for use by my family, but is that necessary? Will it do harm at that level?

Thanks, Ben.

 

[Jimrahbe]

SH,

You have been a member since 2011??... No one can answer that question as you did not tell us what your CYA is...

Check out this chart.. FC/CYA Levels

Thanks,

Jim R.

 

[woodyp]

14 CAN be fine...depending on your level of CYA in the water. My guess is that you're running twice as high as need be.

 

[surfhawaii]

CYA = 70.

 

[Jimrahbe]

With a CYA of 70, you are good to swim up to an FC of 27 ppm..

Jim R.

 

[surfhawaii]

Ok, thank you. Maybe I'm just a dunce here and I've looked at the link you gave, watched video, and I use the pool calculator, etc. but I don't see how you got the calculation of FC 27. I haven't been on this site in awhile because haven't been having problems that I couldn't deal with. SWG is fairly new. Can you point me to the link so I can do my own calculations?

 

[Jimrahbe]

SH,

If you look in the SWCG section of the chart you will see that with a CYA of 70, the SLAM FC level is 28.. You can swim as long as your FC is below the SLAM level and that is why I said 27 is safe..

Since measuring CYA is not too accurate, I would not swim at anything over 20, but I was giving you the theoretical answer.

Thanks,

Jim R.

 

[surfhawaii]

Ah! Ok, understand, thanks for your help.

 

[thefloatqueen]

SH,

If you look in the SWCG section of the chart you will see that with a CYA of 70, the SLAM FC level is 28.. You can swim as long as your FC is below the SLAM level and that is why I said 27 is safe..

Since measuring CYA is not too accurate, I would not swim at anything over 20, but I was giving you the theoretical answer.

Thanks,

Jim R.

Anything over 20? ? Is that for all pools or just saltwater? Mine is 50 (“manually” chlorinated/non-saltwater) so your response kind of scared me for a second lol

 

[JJ_Tex]

Floatqueen - Jim was referencing FC of 20, not CYA of 20. I assume you are saying your CYA is 50. According to the chat below, for a CYA of 50 you should target FC of 6-8, never let it drop below FC of 4, and it is safe to swim up to your SLAM FC level of 20.

The Free Chlorine and Cyanuric Acid Relationship

Managing your cyanuric acid and Free Chlorine levels is key to stabilizing your pool. Learn how these two items affect each other.

www.troublefreepool.com

 

[thefloatqueen]

Floatqueen - Jim was referencing FC of 20, not CYA of 20. I assume you are saying your CYA is 50. According to the chat below, for a CYA of 50 you should target FC of 6-8, never let it drop below FC of 4, and it is safe to swim up to your SLAM FC level of 20.

The Free Chlorine and Cyanuric Acid Relationship

Managing your cyanuric acid and Free Chlorine levels is key to stabilizing your pool. Learn how these two items affect each other.

www.troublefreepool.com

Ohhhh, okay! That totally makes sense. And yes, I meant my CYA is 50. FC of 50 would be insane lol!! I always keep my FC at 6 and use my PoolMath app to log my readings. I just got confused since he was talking about CYA before mentioning 20, so I thought he meant a CYA of 20. ??‍ Thank you for clarifying!!