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A couple of comments. First, having seen pics of the koi dtbh cultivates, we could all wish to do so well. Hard to imagine doing better short of a mud pond or Momotaro's greenhouse. Second, if the fresh water is that high in nitrate, the system is doing extremely well to maintain the level so close to the source level. Third, to the extent a Bakki-type system results in lower nitrate levels, I'd look at degassing effects lowering ammonia levels, which in turn produces lower nitrate. [I recently read a post about an experiment that concluded there was no reduction in ammonia levels as a result of degassing. This conclusion is contradicted by my personal experience. I think everyone has smelled the ammonia released in the atmosphere by degassing units, open trickle systems and the like.] Fourth, I do not believe that I've read or heard of anyone with a Bakki-type system concluding that they do not work, but much disagreement about how they work and the comparative benefits of less expensive alternatives. I think sometimes the discussion gets extreme when someone de-bunking a claim regarding how it works goes further to say this sort of system does not work. Perhaps not the cure-all some would like it to be, but not many ponds would be unimproved by the addition of a shower system, whether it be an open shower like the Bakki-type systems or the enclosed shower of a trickle tower.
As an aside: dtbh, how about progress shots of your Shiro Utsuri some time soon?
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