I with you Dick, there is more that one way to filter a koi pond and everyone has their own opionion on which one works best. In my opionion, they all work it's the maintenance that promotes their efficiency. With the right up keep they all work, and without it they all crash.
If there is truly one "PERFECT" system, I myself and the rest of the koi community would be interested.
Low Blow's are unappreciated on this board.