FC diminishing

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FloridaPoolNewbie

Bronze Supporter
May 5, 2021
171
Florida
Hi ya'll, having a trouble holding FC over the past few days. Tested FC yesterday after a week of no testing and had zero FC. The SWG has been set to 100 for a while now, cell looks fine. It's probably 4 years old and haven't had issues w. it before producing. Pool is clear and I don't suspect algae yet. In fact I added liquid yesterday morning to get up to 7 ppm and this morning it was gone. It's been over 100 daily here in Florida but that is an extreme loss with the SWG running so high in conjunction to my add. Thoughts? SLAM?

FC- 1
CC- .5
PH- 7.4
TA- 60
CH- 350
CYA- 80
Salt- 3000
Temp- 90
 
If you do have an algae problem after slam is complete then you would proceed to the overnight chlorine gain test to sort out your swcg issues.
Here’s what that cell (in optimal condition) should add to your pool in 24 hours
IMG_7317.png
With 4 years of year round chlorine production it is likely nearing the end of its lifespan.
 
FloridaPoolNewbie said:
Well although I didn't do a true OCLT, it was at 7 yesterday at noon and 1 at 9 am this morning. Also, I always did an OCLT and SLAM with the SWG on 0%.
Click to expand...
Yes-
The Overnight Chlorine Loss Test is in total darkness with the swg off & no other additions of chlorine to see if organics/algae is consuming your fc.

The Overnight Chlorine Gain test is in total darkness with swg on to see what production is.
In either scenario you must remove the sun from the equation. For the overnight gain test you must also eliminate algae/organics first as well.
 
Mdragger88 said:
Yes-
The Overnight Chlorine Loss Test is in total darkness with the swg off & no other additions of chlorine to see if organics/algae is consuming your fc.

The Overnight Chlorine Gain test is in total darkness with swg on to see what production is.
In either scenario you must remove the sun from the equation. For the overnight gain test you must also eliminate algae/organics first as well.
Click to expand...
OK, will SLAM today, and just double checking....safe to swim in SLAM up to the level considering CYA level?
 
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