What type of filter socks are these???

[jerallenttu1]

I really like these filter socks because they have so much surface area and catch way more than the regular felt filter socks. The problem is I can't find them anywhere except my LFS and they are $16 each. I have searched amazon, but can't find what they are actually called to get a good search

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[Peace River]

A search for an "aquarium filter bag blanket" will pull up something similar and may give you a place to continue search. Good luck!