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I use a 7" cup and ditched the socks. I had 6 socks, 5 felt and 1 mesh, and would wash them when the last one was added to the sump.
Wife did not like cleaning them in the washer and they still look dirty. I did not want to keep replacing them so went with a cup.
I use poly fill and just toss...
This was posted by Marine Depot a few years ago. Hope it helps.
How to Choose a Properly Sized Return Pump for Your Saltwater Aquarium - Marine Depot Blog
I would think this has to do with trade regulations for one. Also, they would have to account for voltage and redesign of the plug for the US.
If a fairly new company may not be worth it but in time they could be available here if they get good reviews and company takes off.
I would assume something is bothering it. Does the base look well? Any dark spots or abrasions?
Any fish picking at it or resting in it? My devil hands closes when the hawkfish sits in it.