I have a pond that is approximately 8000 gallons, with a savio skimmer. I am wanting to add a bog filter. Because my pond is fenced, I am limited on space for a traditional bog filter. I am in the process of building my waterfall. Is it possible to turn my waterfall into a bog filter. I do not want to run 2 pumps, because 1 pump is costly enough. I am planning on the waterfall placement on these huge boulders obviously.