Anyone tried the SunSun HW-603?

Good afternoon all,

I've been looking into a canister filter for quite some time now and one of the ones that has caught my eye is the SunSun HW-603. Unfortunately, I have been finding some mixed information on how this particular model or set of models works. Some models show the flow going from top to bottom (usually accompanied by a larger side pump, see Amazon), others show bottom to top (small side pump, see Ebay), and still others show that the pump can be moved to accommodate either. Even the directions that come with the unit show two different things depending on where you find it.

Long story short, I'd like to set the record straight. Does anyone have any first hand experience with this model and if so, could you let me know how this thing actually works?

Thanks!
-J.P.

Update:

After doing a bit more digging I found out why I was seeing a difference in the products. There are 2 variations of the model HW-603B. One of which has the pump attached to the bottom of the canister. This pumps water from the canister into the tank and thereby pulling water into the top of the canister via suction. The other variant of this model has a submersible pump that is connected to the filter inflow. This pumps water into the bottom of the canister, forces it through the filter media and then out the top of the unit. Hopefully this isn't a waste of space and someone else finds this useful as well! Thanks again.