Testing positive for chlorine but haven’t added any and SWG is off

JenniferMarie90

Well-known member
Feb 16, 2021
130
Las Vegas, NV
Pool Size
14500
Surface
Plaster
Hey all, I will preface this by saying this is my first winter with my pool so I’m still trying to get the hang of things. I went to test the chlorine today and my water turned pink indicating that there is chlorine but my salt water generator says “cold” indicating it’s off due to temperature. I haven’t added any liquid chlorine since my pools temp is 42 degrees. Is it possible something is wrong with my testing kit or that there’s residual chlorine from a few weeks ago when my SWG didn’t say “cold”?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
47,422
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
At low water temperatures and minimal UV exposure your FC will last quite a while. I do suggest you keep the FC in line with the FC/CYA Chart regardless if the SWCG is working or not. In Laughlin, my SWCG has worked some days and not others as my water temperature is fluctuating around 52F.
 

Newdude

Mod Squad
Gold Supporter
TFP Guide
Jun 16, 2019
14,423
NY
Hey Sis !! Also, the SWG does a self check every 12 or 24 hours and will turn itself back on if it sees the temp went high enough before reassessing at the next check. It may run at times you aren’t paying attention to it assuming it’s still off. At 42 degrees it’s probably not the case this time, but it might be down the road. (y)
 
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proavia

LifeTime Supporter
TFP Guide
Feb 6, 2015
3,010
Chandler AZ
Pool Size
12300
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
Now that your SWG is not consistently running, be sure to use the non-SWG part of the FC/CYA Chart. Add liquid chlorine as needed to mantain the FC/CYA ratio for a non-SWG pool. Once the water temps consistently remain above the SWG cutoff point, you can move back to the SWG part of the FC/CYA Chart.
 
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