http://www.amazon.com/gp/product/B000255NXC/ref=oss_T15_product
I just did a water change, and it could not have been any cleaner. It was so easy, and if you don't have a hose or something when you're setting up your tank, it makes it SO much easier. No more carrying bucket after bucket after bucket.
The only thing that concerns me is, it says it aerates the water when you're filling it, which de-chlorinates it. I'm a little skeptical, so I added some to the return stream as it was going in. Hopefully that will be enough to get rid of it.
Two thumbs up to this thing so far.