Adam wrote:

Do these things "work?" That is, doesn't the nitrate have to turn into
something?! What is the waste product of the de nitrifying bacteria?

A web search turns up several articles. Basically, the denitrator is a bacterial
filter that contains cultures of bacteria that eat oxygen. These bacteria remove
the oxygen from the NO3, producing free nitrogen as a byproduct.

See http://www.aquaworldaquarium.com/Den...tructions.html

George Patterson
Coffee is only a way of stealing time that should by rights belong to
your slightly older self.