An official water changer is probaly the way to go, I just hate the thought of spending 50$ on a rubber hose. Not that I don't have the $$$, its just my father would kick my a if he saw me shell out cash instead of doing a little (ok, a lot) of hard work! He was born in the early 1930s , hieght of the great depression, and if he were alive, I'm sure he would be disgusted by my " wasting" money on fishtanks. In memory of him I try to keep everything as low tech and chemical-free( and yes, as cheap) as possible.
"Be the change you want to see in the world."