FC Question after Refill

DanF

Silver Supporter
Mar 17, 2019
610
Chandler, AZ
Pool Size
12500
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
I drained my pool recently because of high CH. After the refill I added:
- 3 days ago: 1 gallon of 10% bleach purchased at Walmart with a date of 2024/324 (roughly two months old)
- 6 days ago: 1 trichlor tab.

I have not added any stabilizer yet.

After adding the bleach my FC measured only 3.5 and I was expecting around 8. Today I tested 0.
Could the bleach have been weak?
My FC reagents were purchased last October, I don't believe they are the issue.
Would the FC dissipate this quickly with no stabilizer, at this time of year, with a water temperature in the low-mid 50s?
If it's the lack of stabilizer I'll walk away embarrassed, but I didn't think stabilizer was this critical at this time of year.
 
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