I'm not sure I know what you mean by my outlet to the pool. My three bottom drains go to a settling tank with filter matting and brushes. Then to a 5,000 pump that pushes the water to the pipes at the bottom of the bog. The water will then flow up through the rocks and roots of the plants, between the large rocks of the retaining wall and over to the pool part. Each skimmer will have a 3000 pump that will push water to its own watterfall. First flowing up through the 55 gallon barrells. I'm hopeing that the 2" pipe at the top will be large enough so that it doesn't overflow out of the barrel. Then the waterfall will be a drippy planted rock wall filled with ferns and orchids. Drippy in the sense that the water won't be falling with just one stream of water.