Um, I did it accidentally. If you WANT it, I would start with one 80 lb bag of sea salt. If you don't notice a difference, add a second. It's going to take time to dissolve--the SWG folks can tell you how long--I don't think you want 80 lb of salt directly on your liner! I'd punch holes in the bag and let it dissolve slowly, and I'd keep it off the bottom.
Slowly add salt this way till it feels the way you like it--if it tastes salty, it's too much and you'll want to drain some and add fresh water. Better still is to get a salt test kit and aim for the low end of the range.
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