Your solution to an approach that serves as a good example of the filtering processes involved in a water garden pond, which lead me to mention Novak and you wanting to argue with this without providing anything "fruitful" to the conversation.
In a "water garden pond", water quality is the measurement of the level of filtration, both mechanical and biological. Adequate filtration is based, not on the size (capacity) of a pond, but rather on the total biomass supported by the pond. Total SSA (Specific Surface Area) of a pond determines the maximum biomass that each pond can comfortably support by maintaining water quality. When fish are added to a pond's population, this usually increases the total biomass to a level that the existing SSA can not support. Thus, supplemental filtration, usually in the form of a 'bio-filter' is incorporated in order to increase the total SSA to the level required to support the total biomass. This SSA provides complete nitrification, resulting in Nitrate as the main end product. Plants and algae utilize this along with Phosphorus as nutrients to support their growth. High Nitrate levels are rarely encountered in a "water garden pond" hence no auxiliary denitrification is required. In a dedicated Koi pond, however, because of the absence of plants Nitrate levels can rise to a problematic level.
Although some denitrification is carried out by autotrophic bacteria, the largest percentage is converted by heterotrophic bacteria in an anoxic environment. The end product being Nitrogen gas. There are several configurations that will provide this with the anoxic trickle tower being the most widely used mainly because of its simple design, efficiency and required footprint.
Fruity enough for you Charles? Tried to keep the language simple for all to understand instead of displaying my command of related terminology and nomenclature as some others would.
Now back to the real subject of this thread.
Good catch on the donation option on the OP's blog, Randy. I missed that. Maybe I should consider adding such a feature to my blog.