Hi. I think that canister filters like the one pictured are better suited for indoor use.
You are better to buy a dedicated outside pond unit ( or make one yourself - YouTube is your friend!)
I have a Boyu unit - okay , but not great. My pond is about 4x2x1.5m - and i need to clean filter elements monthly. I also had to fit a stronger pump, as the original did not last long. (about 6 mths). I use bore water - and it is Very hard!! Not salty , but heaps of Calcium.