TEWA: I did not read SMG's experiment as negative toward Bakki Showers, but understand that some took it that way. She did conclude that lava rock was as good as Bacteria House. [She also concluded that Bacteria House affected the taste of beverages, so maybe something in the infra-red rays after all?
] The point that stood out most to me, however, was that a shower system did a great job supporting a lot of fish all by itself, so long as there was an in-flow of water. Without the in-flow, the water became cloudy. SMG's experiment taken together with the experience of so many thus far, led me to get the Bakki Shower (and Bacteria House) as an element of the filtration on my new pond. I am no where close to being ready to convert over to Bakki Showers solely, but I am convinced that it accomplishes some filtration goals better than other methods.
Looking forward to JR's discussion ... whichever board it occurs on.