I think its a bit too Rube Goldberg. I use an 8 or 15 gallon pot for a mash tun. It has a false bottom. I consider it batch sparging but with the ability to recirculate so I can heat with direct fire, and since the pump is there its also power vorlauf. I dont care about channeling because its batch sparging. The recirculation is only to prevent scorching and to set the grain bed during vorlauf. This gadget seems to be an elaborate expensive version of what I do. In the photo where its empty, the water is spraying every which way. Once grain is added that center tube will be fingered like a clarinet by the grain and the water will follow the path of least resistance. Seems like anyway...