Geiserailie 15 Pieces Aquarium Filter Media Bags 150 Micrometer Fine Filter Bags Mesh Reusable with Zipper for Activated Carbon Resins(5.5 x 7.9 Inch,Nylon)

Definitely value for money. It's a little bigger than I needed but performs as I expected. It's durable and can be used for extended period of time without damage or loss in performance.

Put these in all of our tanks. These are very well made bags and the size is perfect for our tanks.

-Good size for my aquaclear 30gal HOB filter. Works great with carbon and similarly sized or smaller media. Would work fine with large media but a larger hole mess would be better for flow. Also a great value. -Biggest pro is they even work great with my purigen resin media without leaking the media out. Also survived the bleach/regen process. -Only complaint is the zipper doesn't open very wide so filling can be quite messy without a funnel. But otherwise works perfectly. And they could be about an inch longer to maximize filtration for my size filter but I imagine it's this size to fit a wider range of filter brands. So not that big of a deal. So far they're the best I've found for my application.

My ph was low so I wanted to add crushed coral to raise it a bit. These bags are the perfect size to add to my Aqueon QuietFlow 20 (along with a bag of Purigen to keep the tannins out & water clear). They’re strong, and zip well!

Ideal for purigen or charcoal for aquarium filters.

Great to use, perfect size and sturdy. Put all sorts of different aquarium items in, washed, rinsed many times over and still sturdy and easy to clean off any muck.

I used purigen in these bags and I had beads getting loose. The zipper doesn’t close tight.

I use them for dirt substrate and it keeps it together and also allows the roots to access the soil. Does what I need it to do.

Works great too keep small particules products in

Recomendado para el uso de purigen

En algunos reviews no les gustó el espacio libre del cierre para poder meter el material. A mí me pareció una ventaja puesto que lo usé para Purigen y Matrix. Buen espacio para filtros de nano acuarios de 8-10 galones

No me gusta la malla y son demasiado pequeñas difícil hasta meter el producto. Lo único bueno es que tienen cierre

buy these and buy bulk the medium to use in them and make your own filter medium solution. presoak them in neutral solution for fish tanks, and rinse well before using. Wash with natural detergent (special order), than soak in neutral solution and let air dry, and than make up your medium and fill bags, store in dry place. So much cheaper in the long run for fish tank owners.