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The test procedure Mike suggested a few posts above would have no validity from my perspective no matter what results came from it.
Ponds are outside things. The sunlight "should" make a difference to the entire process, especially the bakki shower process.
So any valid experiments need to be either done outside in the Sun, or in a greenhouse with plenty of sunlight coming into the pond from the roof and sides of the greenhouse(s).
Artificial conditions never match the real thing. So for a real result, the test must be real, in an outside pond setting, IMO.
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