Thanks Edd, that helps
Generally we suggest adding liquid chlorine or plain old bleach, as cal-hypo adds calcium to your pool, which overtime builds up to high levels. Not real important if you have a vinyl liner. Your CYA level is lower than the suggested levels for SWG pools (60-80 is recommended).
The relationship between CYA and chlorine is important as you can see in POOL SCHOOL.
TA and PH are good, although at the low end of suggested levels.
As far as adding salt, try to stay 200 -400 PPM ABOVE optimum level for your unit. Whatever pool math says for that number you would add and not run SWG for 24 hours to allow salt to mix in well.
I would suggest adding granular stabilizer to raise CYA and add salt, maybe half the amount now and the rest tomorrow. brush the salt on the bottom and it will dissolve quickly.
In the meantime see what pool math says your FC level should be for your CYA level and just add bleach to maintain that level till SWG is ready to go.
Based on your numbers and if your water is clear, Swimming should be no problem this weekend.
Hope that helps
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I might add, if you have any Tri chlor, you can add it instead of bleach, as it will raise your CYA, which in your case would be good. Just don't use it long term