I think it would depend on stocking levels. If you only keep a couple of fish it would be fine but if it is stocked right up it would not be enough.
Think about a fully stocked aquarium, you want 3-5 times water volume turn over per hour. I have close to 14 times due to plecs and relatively high stocking rates. You would only have a turn over of 0.64 times with said filter so if your pond was only 10% stocked it should be fine.
Hope this helps.
Dylan