for the tower cooler w/o the scotch brite pads the GPH should be fairly high. mine's at 400gph (Rio 1400) and i could say that i would like a stronger pump =(. my tower is about 3ft high and to get good droplets/streams out of your showerhead/aerator you need a fairly powerful pump. or else it comes out like crap, no individual streams. so get a powerful pump and the fan using is 92x92x25mm 42.4 CFM. w/ 33 DBA of noise. since i have the tower i'm gonna be bias and tell you to go for the tower cause more poeple have it (you get more support and info) and in my opinion it performs better. well as you can see from my specs in my sig it does do its job. well anyways dont hesitate to email me if you need help cause i know some people out there that dont respond when they get an email about technical stuff. g'luck.