There's all kinds of opinions on that product that stretch from "it's a miracle" to "it's the biggest piece of crap anyone could waste their money on." A quick search on Google or Yahoo (include the hypen in Eco-Aqualizer) will show you many threads from other forums and some even from this forum. Here's a link to a site trying to discredit the claims: http://rexgrigg.com/debunked.htm
Personally, I'm not a believer in it doing much of anything. I can think of a dozen other products to spend my money on before I'd even think of adding one of those to my list.