Check out the website, it gives a lot of detailed info. www.edgesaver.com
When I first bought the product I thought it was just another make a dollar product. Not so! I didn't believe those little tablets they sell with the system even worked. Amazing, put one of those tablets next to a drop of water and it actually sucks the water into the tablet, cool stuff!! If you don't believe me try it for yourself. I definetly didn't waste my money buying the EdgeSaver system.