You'll probably want to add about 3 lbs. of baking soda but not all at once. Maybe a pound at a time. Test again a few hours later and add more til you get it to around 80-100. Your pH is a little low. Bump it up with some Borax. I'd start with a cup. Test a few hours later and add more until you get 7.4-7.6 although anywhere 7.2-7.8 is ok. Both of these products should be added slowly to the skimmer while the pump is running, breaking up any clumps. You can add them one right after the other with no problems.
CYA is slow dissolving stuff. Go ahead and add another half a pound. A week from now, retest your level.
Keep your chlorine between 3-6ppm.
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