Perhaps I could also say it is an extension of the classical Walstad method. There one relies on fish food and fish to produce carbon dioxide and other nutrients. Here it is rice and bacteria.
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It sounds almost too good to be true, but yet perfectly plausible. From what you've said, I would consider it an original idea since it is "an extension" of an existing method, but actually, I wouldn't even call it that, since the approach is entirely different from the Walstad Method, in that this process relies on more contrived circumstances rather than simply letting Nature take its course, as does the Walstad Method. Besides, almost all new ideas and inventions are simply "extensions?" of existing concepts or the combination of previously existing ideas or known principles, yet they are considered original, so don't sell yourself short. The screw is just an inclined plane (a ramp) wrapped around a cylinder, but when combined, they are so much more than either concept alone. Can you imagine where we WOULDN'T? be without the simple screw? Yet sometime, somewhere, someone put the two concepts? together and technology was born. I dare say that technology wouldn't exist without the "humble" screw, yet it was a stroke of genius the first time it was conceived.
If I had the equipment to better test water parameters (CO2, O2, etc.), I would test this out myself, but I don't. While I'm not interested in a high tech system at all (for some reason), this technique intrigues me, perhaps because of the more "natural" processes involved. Of course, I realize that it would be an artificially contrived situation, but the processes involved are entirely natural, so I wouldn't consider it an "artificial" introduction of CO2. If this pans out, you could be responsible for the next big thing in the planted tank hobby!
Do you have the equipment to test the various water parameters? There are many YouTube videos for making inexpensive wet/dry filters; my favorite uses a small, cheap set of plastic drawers sitting in a tank (or plastic tub) sump, and drilled to drip vertically into each drawer/media chamber. Do you plan to go further to test it out? I think it would be best tested by observing all water parameters (nitrogenous? values, CO2, O2, TDS) at each stage of filtration. Do you have the equipment to do that?
(Sorry about all the question marks at the end of words; for some reason my phone seems to add them when I send the post. It's annoying.)