iQuatics5 x Reusable Aquarium Fine Mesh Resin Filter Media Net/Bag Plastic Zipper

Used it to hold a product that absorbs unwanted nitrate phosphate , in the filter of my nano marine tank

I used this to store Seachem Purigen in my Canister filter because their own bags are so much more expensive. These certainly do the trick but the zip seems to be a weak point sadly, it doesn't close completely shut and so some of the little Purigen balls leaked out. Not a huge issue but probably worth just buying the expensive bags.

The 1st one was fine, no problem. The 2nd one was not stitched together on one side

Perfect to use with any filter media

Zip broke after filling it up and zipping it up .

Great for what I needed them for