Our pond is 27 feet long by 9 feet wide. Half the pond is 2 feet deep and the other half slopes to 4 feet at a 4 inch bottom drain. Notice how I round off numbers. In actuality it's not 2 feet deep in the shallow end, its really 20 inches. We use a 4000 gallon per hour Sequence pump from a 150 gallon vortex settling chamber.
Various filters deliver the water to a four foot water fall.
Having read that Dotisu and scaless fish needed only 200 ppm I first treat with 4 tsp. The water turned chocolate brown within 10 minutes. I performed this treatment early in the morning after having installed another extra pump about mid way the length. I let this pump just flow back into the pond for aeration purposes, but it also helped to circulate the KMn04. I figured that because the entire shallow end of the pond is totally full of plants that I had more organic matter than the most koi ponds.