How do calculate how much salt I need

First, you need to pick a target salt level. The salt level tends to drift down slowly over the course of a season because of water replacement from rain and splash out, so it is best to start near the high end of the recommended range. In your case that means 3100 or 3200.

Then you can plug in the size of your pool, current salt level, and target salt level into my Pool Calculator, see the link in my signature, and it will tell you how many pounds of salt need to be added (40 to 50 lbs).
 
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