Pool math question

[val8375]

I have a swg and my cya is at 60. Pool math says target fc is 7 which is what I keep it at but I get so itchy in the pool. I have been reading that fc only has to be at 7.5% of cya so wouldn't target be 4.5? I really want to keep fc lower to see if itchiness goes away.
Thanks for the imput!

 

[mknauss]

What is your pH and TA? Skin irritation is normally tied to pH.

 

[val8375]

What is your pH and TA? Skin irritation is normally tied to pH.

Ta is 80 and ph today is 7.6. The ph has been usually higher but trying to keep it down.

 

[mknauss]

You can run a lower FC if you wish. The potential for algae is much higher. Your choice.

Keeping pH in the 7's is more likely to solve your issue.

 

[val8375]

Ok thanks but Am I running fc too high at 7? Do you think according to the 7.5% of the CYA It should be like around 5?

 

[mknauss]

Ok thanks but Am I running fc too high at 7? Do you think according to the 7.5% of the CYA It should be like around 5?

Running the FC in the target range, or above, is fine. Less likely to have issues if you have a day of high organic loading or a SWCG issue.

 

[val8375]

Running the FC in the target range, or above, is fine. Less likely to have issues if you have a day of high organic loading or a SWCG issue.

Thank you for your help!

 

[Newdude]

Ok thanks but Am I running fc too high at 7? Do you think according to the 7.5% of the CYA It should be like around 5?

No that's flirting with minimum which ironically may cause swimmers itch if bacteria flourish.

I run mine 'hot' at 10 to 14 and nobody knows.