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NO! Don't be discouraged.
FC numbers are looking good, especially with the very sunny morning today and taking the measurements at 7:15. Your CC is down to 2 so it is showing progress... albeit slow... but maybe you found the culprit in the light niches, filters, Nature2, or somewhere.
Hang in there! Besides, you have a vinyl liner so "draining" is not a realistic option.
I'm not about to suggest that you drain. It looks like you are down to normal chlorine usage rates and the CC seems to be creeping down in spite of the cloudy skies.
FormerBromineUser's post reminded me: You did remove the Nature 2 cartridge, yes?
It turns out the pool guys removed the cartridge- either at last year's closing or this year's opening. The vessel is empty and clean.
OK- I wanted to add one more thing: my husband- who loves water but is pool illiterate- noticed "an extra hole" in the side of the pool while he was cleaning the light fixtures. I told him it was a dedicated return jet that the pool installer added assuming that we were going to go with the Legend's automatic vacuum system (an extra $1000). So the return jet was never used. Is this something that needs to be cleaned/maintained? I didn't think so since the other returns don't, but wanted to mention it just in case. I'm going to brush everything down today.
That extra return line is a place where "stuff" can grow and hide. is the other end of that line connected to anything or just capped off?
It must be connected because water comes out of it constantly- however, the pressure is lower than the other returns. It doesn't have a directional attachment on it- literally a 3" threaded opening.
Can you reduce the flow to your returns and increase the flow at this extra line? If so, do it for an hour or so to really force the shock level water in there. You would do the same thing for other water features: fountains, slides, etc. periodically, and especially at high CL levels.
Absolutely don't know how to do that!
Is there a valve for the "extra" line? If so, we can tell you how.
i was never told about an extra valve- was told not to worry about the extra hole…..I have 3 "T" valves. I turn off 2 when vacuuming.
(I probably need to review pool terminology)
When vacuuming, you leave on the skimmer valve. You apparently close the main drain. What changes when you close the third one?