I don't use these as filter socks but as media bags for my purigen as they are better quality than most media bags and I am confident in their durability. I fill the sock with Pruigen, fold over the hole and use the zip tie, done! At 100 microns I can't think of an aquarium environment that would fail. This product appears to be well made and seems to stand the test of time and I will update the review accordingly. I received this product at a discount in exchange for an honest review.
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