Yeah, Mine goes up and down but I don't really use that feature except during maintenance. I pretty much only spin back and forth . It gives more force to knock off mulm and I don't have enough room under my tank to give it a good up and down anyway. Hard for me to get my arm in there. I will say for the up and down part without that feature I would have to take out the whole reactor to replace stones. When I replace stones I only have to take out the inner container which is a basket of sorts.