Question about cleaning a filter

On my old tub, I replaced the filter every year or so. I also wasn't as diligent in cleaning them. My wife did most of the maintenance but I did the filters when I was around (I traveled a lot back then).
On this one, I have 2 sets of filters so I'm hoping to get a couple of years out of them. You want to change them before you start getting enough restriction in them to cause a flow problem.
 
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