anyone use a gravity fed water filtration system?

[rawrpk]

Im thinking about purchasing one of these

anyone have experience with using water filtered this way for their tank?

 

[FuGu2]

Those filter cartridges are only carbon. The cartridges will not remove salts, phosphates, chlorine, etc. from the water. The water that comes out of that thing will not be "RO/DI" water.