I recently received Gefr's filter pack and it looks great.
Even got the O-ring with it and it came in the cutest little box covered with Greek postal stamps
The sock filter looks like its made from recycled granny pantys but I bet it works just as well as the original ones Or better as there is a large plastic framework inside.
I'd recommend it!
As a more tem solution, cleaning with carb cleaner or as a dangerous solution, removing it and installing one external of the tank could work as well. I just fear you lose some pressure with an out of tank filter.