(4 Pack) Acurel LLC Filter Drawstring Lifeguard Media Bag, 3-Inch by 8-Inch

They work great for putting Zeolite filtering material in and that they are re-usable, not too fine of a mesh or too coarse, just right. Thanks.

holds my activated carbon and phosguard. I can't tell you if this would hold purigen as I never used that product. Sorry

I used this to replace filter media that is no longer available.