I currently use a Hayward sand filter and it requires 150 lbs of sand. A co-worker said there is a new product out and it weighs next to nothing. I looked it up and found it, but not sure how well it works and which exact product to get. I need to change my sand next year or the year after, I would have to look. 150 lbs of sand is hard to get rid of since I really have no place to dump it. These new things can get tossed in a garbage bag since they are so light. If it filters better and is less dense as advertised, I would imagine it would be less strain on the pump itself as well.
Has anyone used these and if so, are they better than sand?

http://www.filterballs.com/