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Russ,
It's not necessarily how much filtration you have. It's how well do you maintain the filtration you do have. Some people can get by with less if they know what they are doing. Others can keep adding and still never figure out how to keep koi. I think Waddy makes this point in Koi2Kichi.
Mitch
PS
I'm just now learning how to backflush a bead filter.
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