Denitrator Coil??

Hey i was just wondering, has anyone here built their own Denitrator coil. Would you reccomend building one? I know that this link is for saltwater, but would this same idea work for a freshwater?
http://saltaquarium.about.com/library/blank/bldondiydenitratornew.htm

I went through the website,I have to say its quiet impressive.I am sure it will work for a freshwater tank.Who knows,i might give it a try.

After doing more research yesterday i found that it is fine to be used with a freshwater the only problem which can occur no matter what setup you have, if the water does not flow fast enough you will get an eggy smell, in other words the bacteria are creating hydrogen sulfide(poisionous to fish) . That is really my only worry about the setup but otherwise it sounds perfect. Its a little harder to make without a sump but i found a good pump for it.