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)

These are awesome bags for your phosphate pellets and whatever else you want to use for filters that are great.

This is the second purchase of these bags. They are the perfect size for my fx4s and fx6 filters. Great for putting in Puritan and carbon. Can't say more about it very good products very happy with it

Quick disclaimer - I'm using these bags for small amounts of purigen for my nano aquarium and they work good for that purpose, but I'm not 100% certain they are chlorine bleach resistant so keep that in mind if you plan to re-charge the purigen. Each bag can comfortably hold about 30-40ml of purigen, so I bought the 100ml Purigen bag and was able to split that up into 4 of these Geiserailie bags. The zipper closes just barely tight enough that the purigen granules aren't escaping but to be safe I wouldn't place the bag in with the zipper side down. Overall these bags work great for fine media but make sure you check the dimensions of the bags you're purchasing because the ones I got are way too small for any media larger than Purigen.

-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.

I like the zipper opening. The material and stitching is good. Great to divided my Purigen for my smaller filters.

If your using this for Purigen then this is it. Made some small bags, put them in the HOB filter and holds all the tiny pellets in. Also put a bag in my AIO 20 gallon reef tank to help. Good bag , zibber design holds it all in.

Para mí pesera está genial

Good for purgin!

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

Fine mesh and works well

I use for adding purigen to my aquarium filter. Perfect size. Use a funnel and scoop to get purigen into bag

These are very small, but hold purigen better than " the bag " however I'd probably recommend the next size up. Not that I feel mis- sold to or anything, the measurements were clearly written, so it was my mistake, these would be great if you have minimal space in your filter though, you could possibly squeeze than into internal filters and definately most hob filters

These bags are perfect for Purigen. Way cheaper than “The Bag” if you’re regenerating your Purigen I highly recommended these bags.