Mystery Increased FC

[Rebf]

Hello,

We had some construction done in our pool area last week. Knowing I wouldn’t be able to check on the pool, I set the SWG to Superchlorinate for a few (3) days. The FC climbed to over 10 so I turned off the SWG to let the level drop. It’s been falling gradually.
However, this morning my FC was 7. This evening my FC was 8-1/2. I checked it twice. Is it possible to be generating even though I switched it off???!

Two days ago my test results were:
June 7, 2018 8am
FC 7.5
PH 7.3
TA 80
CH 375-400
CYA 70 (overcast)
Borates 50 (not measured)
Salt 3100
Temp 73

Yesterday they were:
June 8, 2018 8am
FC 7.0
PH 7.3
TA 80
CH 375-400
CYA 70 (overcast)
Borates 50 (not measured)
Salt 3100
Temp 75

 

[kellyfair]

Huh. Is it possible that you had an error in testing previously?

You don’t have any pucks in the pool, right?

- - - Updated - - -

Are you sure a timer isn’t turning SWG back on?

 

[mknauss]

Nope. Circulation issue or testing error.

I assume your SWCG is set to only run when your pump runs. So are you sure you turned it off or set % to 0. The SWCG most likely would have been powered on when the pump is running.

 

[Rebf]

No pucks ever. TFP only and always.

There is a switch on the control box for Super Chlorinate; Auto or Off. It is switched to Off. The generating indicator lights were not on today.

I usually test in the AM before the pump runs. Maybe the level is different in the evening because the water has been circulating?

 

[kellyfair]

Well, let’s see what your next round of testing shows.

 

[Rebf]

I assume it’s a timing issue.
If it keeps rising the I will update here.
Thank you for your quick feedback.

 

[proavia]

"I usually test in the AM before the pump runs."

Testing error due to poor circulation. Pump should be running for at least 30 minutes prior to pulling a water sample for testing.