It took about 20 minutes to half an hour for my wife and I to dissolve two 40# bags. She had fun playing with the pellets, piling them up, moving them around with her feet, etc. The biggest thing was that we essentially were in the pool to help stir up the water. I'd recommend helping the salt dissolve.
What I did was take a bag and open it in the middle of the pool, and spread it around a bit from the middle. We then shuffled it around with our feet until it was pretty much dissolved.
1200ppm is about where we want to get to, so adding two bags will probably be perfect for your pool. If you aren't sure, then just get one bag and start with that. You can always add another later, but if you are happy with the results of just one bag, then there is no need. I did the same thing, I started with two bags, knowing that three or four would be what I ultimately will want to add. Two is nice, but I'll be adding one more sometime this week, and maybe one more after that.
Just remember though that like CYA, the only way to get the salt back out of your pool is to drain and refill, so it's better to use less than you think you need than to overshoot your goal.
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