I just thought I'll mention something I read about a year ago regarding trickle/wet dry filters (reason why I insisted on bakki shower). It says that when ammonia is converted to nitrite what is actually produced is nitric oxide and nitrous oxide gas which will easily disolve in water and form nitrates. So if you have a trickle filter with sides open or heavily exposed to air the gasses are just blown out before disolving in the water so no nitrates are produced. That probably why bakki showers are designed like that. Bioballs trickle filter will work the same but the filter height must be atleast 3ft. high to de-gas ammonia and water flow must be slow to give time to the bacteria to feed and that wouldn't be prctical for indoor because of size, and that is where bacteria house comes in. I am now planning on building a denitrator, I am thinking maybe about 2,000 ft of enearobic tube. My settling tank is actually hooked up for this setup, I installed a valve a teh bottom of the settling tank, when I was still building, it to hookup my denitrator. Another changes I am thinking about is putting plants on the walls and plants on driftwood.
