Review on 🐠 Efficient Aquarium Filter Bags with Zipper - Tatuo 20 Pieces Media Mesh Bags for Charcoal Pelletized Removal in White and Black by Bob Richardson

They do what they are designed to do! Bad reviews are a shame. If you can't figure out if these holes are larger than expected but you know the basic math to figure out the mesh size you need, they work perfectly. They are used for rocks for hill aquascaping or for filter materials! DOES NOT WORK FOR CARBON. look elsewhere But if you're looking for something to hold filter material or stuff it with rocks for hillside scenery, this is for you! I use it for media, slope landscaping and substrate lifting.