A lower flow in the bog and less water volume i feel is better then pushing lots of water through the bog to fast my bog is 18 x 10 and 7 feet deep i push about 6,000 to 7000 gph through itMine is 26ish feet long, the slits near the pumps are further apart then the slits at the far end of the bog. It is working great.
You don't need power, like @poconojoe says, to run your bog, just a pump , a T off your existing pump or a new pump and just run the lines to the bog.