My purpose for a Grant does not even concern a stuck sparge. I have a direct fired RIMS system and I have repeatedly crushed my false bottoms. Even when slowing the output flow to a crawl. The false bottom I use is the Adventures in Homebrewing PICO style false bottom.
It looks like this: http://www.homebrewing.org/Stainless-Steel-PICO-style-keg-kettle-false-bottom-wsupports_p_1010.html
When I say crushed, I mean crushed like a pancake. I just could not believe the amount of pressure that was being projected onto the false bottom. I use two pumps. One is a March 809 and the other is a March 815. Nothing out of the ordinary there. I have tried changing hose diameter, pump positioning, re positioning pickup tubes. Everything. A grant seems to be the only option to fix my current dilemma.