Pressurised filter have their place, but I feel I should correct you on a few points.
They do not have a "backwash facility" (sand filters do)
The one you are looking at has a "rinse option" All it does is, allow water to flow to waste instead of the pond, the idea being it will clean the filter sponges. It doesn't work very well.
Look at
this one:
You see the blue handle (The blue oblong thing behind the blue round thing) well, its a handle that pulls the filter sponges inside up, it compresses them, you do this a couple of times (You turn the blue knob first) and it cleans the sponges much better, then you let it run to waste.
Things to consider:
As your pond is raised, where will you put this filter? some rely on the surrounding soil to stop them from bursting.
They also need 3 pipes (flow, return and to waste) will you be able to hide 3 pipes?
Will such a filter be big enough to cope? (I mean the flow rate / pond volume)
A biological filter / uv works better if the flow rate is slow.
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If I were in your shoes (and I am not) I would buy a smaller more energy efficient pump than the one you have and build a wall or some thing else decorative* round your current filter.
Pressure filter do have their place.....................
*Bamboo screening, trellis, brick wall
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:?:
What pump do you currently have?
What is your pond volume (or its dimensions)
What is your pond stocked with? (eg,One goldfish, loads of fish, some koi?