When I unpacked this thing I had high hopes. It's pretty durable and not cheap junk plastic. In a straight stream, it pushes a lot of water. Unfortunately I bought it for reverse flow. Backflow will block the normal outlet and open the side port to suck water. As long as the water exits below, the flow rate is very low. To be honest I don't see enough pressure to push water back through the gravel pack. Very disappointing! I eventually upgraded to a 70 and ran right through the gravel. It works well despite my not so attractive pump. Another design flaw is that if you hang the pump at the back of the aquarium, you can't direct the flow directly to the side, as that direction allows for top-bottom separation. its shortcomings, it moves some water and filters great with a quick filter attachment (sold separately).
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