I found a too good to be true advertisement in the November issue of Tropical Fish Hobbiest, called "Eco Aqualizer". They're reasonably priced (suspicion #1), touts the best ionization ever invented, guaranteed 180 days or full money back, never or almost never needs water changing again. Any aquarists ever heard of this product? Check it out on "www.ecoaqualizer.com" and see what you think. I've heard that ionization is fine and dandy, but it cannot replace gravel cleaning to remove mulm, detritus, etc. Help me, 'cause my trigger finger for credit card purchasing is getting itchy!!!! :sim: