Welcome to the forum-you're in the right place! My owners manual gave approximate amounts of salt to add for various size pools. First, though, you need to get salt test strips (about $10) so you can determine how much salt is already in the water. One source is the sweaty people who jump in that cool pool. My manual recommended 800# for my pool but it only took 540# to bring it up to proper salinity. Guess we have a lot of sweaty friends! Good luck!
Hal