Calculating FC Output

JonF7

Bronze Supporter
Jun 9, 2019
19
New Jersey
Hey everyone, I just converted to a SWG this year and so far so good (minus an consistent air leak, new pump gaskets / plugs coming in tomorrow); but had a question on calculating % and run time.

Here are my pool readings before I ran the SWG at 100% for 24 hours straight:
FC = 6.0
CYA = 55 - 65? (bad at this one)
PH = 7.4
TA = 80
CH = 150
Salt = 3600
CSI = -0.9

After running the IC40 at max for 24 hours, I checked my FC and it was at 13.5, a 7.5 increase. That seemed higher than I was expecting, but questions below:
  1. Should I be concerned about a 7.5 FC increase in 24 hours, or is that about what you would expect?
  2. If that number is in the ball park, for calculations can I just do some napkin math? E.g.,: Running a at 40% would be give me 3 FC over 24 hours, and 1 FC every 8?
  3. I tested my PH with the FC at 13.5 and it read 7.8, should be concerned that the air leak is aerating and dragging the number up, or disregard since its over 10?
Thanks and sorry for the basic question, I've read so many articles at this point its good just to talk it out
 
1- Your SWCG is working that is good. By researching your cells output relative to your pool size you can estimate your FCppm production in 24 hours at 100% using Pool Math.

2- I like empirical calculation and estimations, you are on track. Pool Math also can guide you in estimating your run time and % generation to meet your daily demand. Research your systems generation cycle as you dial it in.

3- Testing pH at FC levels above 10ppm with the drop test is not reliable, let your FC fall below 10ppm and test again before making changes.

Also the CYA test range is logarithmic so don't assume between levels of 10ppm and round up.
 
Last edited:
  • Like
Reactions: JonF7
Looks like pool math matches perfectly to my estimations. Somehow I never knew there was a SWG in the additions tab. Thanks again!
 

Attachments

  • 209F39BE-FB18-4C9A-A1F5-6DAF27765D7D.png
    209F39BE-FB18-4C9A-A1F5-6DAF27765D7D.png
    39.6 KB · Views: 5
  • Like
Reactions: Oly
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.