I would recommend returning this filter if you still have a chance. They are not really very good as they are quite large but have very small (and very expensive) filter cartridges. Due to the small size they are not really all that good at filtering all that much out of the water. The sponges, like Travis said, are also quite small and they clog up quickly. I can't remember if the outflow is adjustable on that filter, but I don't believe it is.
You would be much better off with a Fluval in tank filter, or a Duetto 50 or 100. I have used the Duetto and they work quite nicely. They are a little more expensive but they are also of much higher quality, have more filtering capacity and have an adjustable flow on which you can change the direction.