Losing Chlorine and SWG possibly not keeping up with demand

Time to SLAM-A-RAMA!! You will get to know your pool so well during this time - because that's the only thing you'll be thinking about!

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So I just got back from my trip late last night and tested first thing this morning.

FC tested at 6.5. It was 10 the morning that I left 9 days ago. We had a lot of rain over the last week, so hopefully the loss was due to water replacement but I'll know once I do another OCLT.

When I did the OCLT the night before I left, the loss was 0 ppm over 6 hours.
 
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I ran the OCLT last night with the following procedures and results:
Turned off the SWG at 7pm and continued to run the pump for an hour. Then performed test at 8pm.
FC = 10
CC = .5

This morning I turned on the pump only (no SWG) at 0545 and performed the test at 0632.
FC = 9.5
CC = .5

Just to be sure I tested immediately again and got the following:
FC=10
CC=.5

Does the .5 difference between the first and second test fall into an acceptable error threshold and indicate I am good to go? Should I still do a SLAM since my CC has been rather consistent at .5 throughout my tests?
 
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