I took a tap water filter that I had bought years ago to make water for my tank. It turned out to be impractical. I modified it to become a phosban reactor. The pump sits in my sump connected to a ball valve to control the flow. Water comes up from the bottom and fluidizes the phosban. The return flow feeds back into my filter sock. At least it didn't turn out to be a waste of money. I guess you could modify a clone to do the same thing.