How long for FC to drop in SWG pool

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Q

Quickstep192

Silver Supporter
Jun 30, 2022
81
Annapolis MD
Pool Size
15000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
I just got my TF Test kit and discovered that the FC results that I was getting from the old test kit were low. What was showing FC=4 on the old OTO test kit is now showing FC=9 using the FAS/DPD test using the TF test kit.

After I decrease the cell output, how long can I expect it to take for the FC to “burn off” with CYA of 70? It’s HOT and sunny here (except during thunder storms :)
 
With a CYA of 70 it is safe to swim up to a FC of 28. FC of 9 is no big deal and not very high. Don’t worry about it and go swim. Whenever the FC drops you will be fine.
 
Quickstep192 said:
I mostly want to lower the FC level just a bit so I’m able to read FCcon the OTO test kit since it’s easier for spot checks.
Click to expand...
As you discovered the OTO test is not very accurate. It basically tells you if chlorine is in the pool and not how much.

You really cannot dial in SWG % using the OTO test.
 
With CYA of 70 your FC should be in the 5-7 range. You cannot measure that accurately with the OTO test. That is why we require the FAS/DPD test for TFP Methods.
 
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