Yes, I've heard of stories from folks that didn't get a salt test done before they added salt and ended up having to drain some from their pool to get rid of the excess. I had Leslies fo a test that came out at 400 ppm I think that will result in a15 bag need, but I'm only going to put in 13 or14 at first then run a test myself for the last bag or two!
Lol, not ready to jump in the pool yet. Temps still in the 40s here. Not sure of that since my pool thermometer is still Tango uniform!