Hi, I am converting my swimming pool (25000 gallons of water) into a salt water pool.
I just bought the Jandy generator and I need to get 80 lbs of salt ( I think) . It clearly states to get 100 percent NAC1. Can I use Dead Sea Salt?

You'll need more than 80 lbs. You can buy the salt from Lowe's, Home Depot, or any pool supply place. Find out what your pool generator needs in PPM then look on the pool salt bag, should be able to calculate it. Let me know if you need more help. Likely you've found your answer by now though.