There are some older threads on this stuff, and as all my preivous replies, in general I remain very skeptical. CFC is right on about pollution removal, and even then this product does not remove to low levels of toxins that are in our air and water. Stuff like paint fumes, and cigarette smoke, and carpet fumes, and cleaner fumes, and so on. We just have to open a window to freshen our environment, but if this stuff gets in the tank it will be at small levels, but long-term exposure even to low levels can cause chronic problems. Partial water changes on a regular schedule help reduce these levels. One every six months might let the levels of this stuff build up too much.
Then, take a look at this old thread:
http
/www.fishforums.net/index.php?showtopic=84327&hl=, there was a member that set up some guppy tanks. One was a control with normal water changes, and one used this Easy Balance stuff. The guppy tank with Easy Balance in it did not produce any fry in several months. And, let's face it, if guppys aren't producing fry, they are clearly not happy.
There are lots of products out there today with many claims, but how ever did fishkeepers do this stuff before these great new chemicals came along?!? I always try to go back to the basics -- the old timey fishkeepers may not have known exactly what species of bacteria was growing in their filters, but they know how to keep their fish alive and thriving -- without all the buckets of chemicals you see at the LFSs now.