JohnHuff
I know nothing.
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There is an extremely simple solution for this.We found if we cycled the filter with the buttermilk, sugar, baking soda, and household ammonia, then did a 100% water change, everything was okay. That seemed too much trouble to me, and too likely to kill fish when folks did not understand the need for the 100% water change before adding fish.
Just do the cycling in vitro instead in vivo (so to speak).
To explain further. Just do the cycling with all that stuff in a stock tank. Once you've got your bacteria in the filter, take the filter or media and install it to the pond. That should work.
And don't forget the other article on the strength of the biofilm. According to that article, it take sandblasting to kill the biofilm so you should be able to move the filter/media no problem.
Not sure I'm 100% convinced about the "invincible" biofilm since there needs to be air/water/nutrient exchange for the bacteria to live and if the biofilm is so strong that you can't kill it with chemicals, neither can nutrients cross it. O2 and H2O might be small but N compounds will be bigger than cleaning solutions (such as Cl or H ions).