Been using these for years and they are fantastic. I add a few boxes to my canisters, the filter folks never send enough, I like to cram my filter trays with as much as they can hold.

They come in a usable mesh bag I can drop in my hang on back filters. I have cut a few open for canister filters but I could have just lined the tray with the bags.

They come in a bag in a box. Sounds normal right? Well it is not. I have received bio media in other orders that were not "contained" and a fine dust coated EVERYTHING in the box, and when I stored extras everytime I moved them a dust was released. Now I can stack boxes till I am ready, open, rinse and use. Keeps my fishroom cleaner!

Love how Co-op thinks of every little detail!

I used the bio rings along with the Aquarium Co Op black airline, check valve and Ziss air stone for my DIY filters. All products are of great quality. I definitely recommend using these items.

bigger than i thought it would be since i didnt read or looked at the pictures and now more reason to like it. like shown on the photo, thats the size, mind the frying pan, its what i use to broil the cucumbers

I replace my bio wheel from my Marineland 200 and put it the filter compartment next to my sponge filter for my 30gal tank.

Great product, shipping, tracking, and price were as described and very reasonable! Great way to enhance a hob filter unit!

I was inspired after watching Cory build the sump for the 800gal, to build one for my 100gal pleco tank. I have never worked with bio rings before, and I can't believe what I have been missing! They offer so much surface area, constructed very well, and come in a sturdy bag! They keep the water polished clean and I love knowing my tank is overall healthier! Shipping was Amazon Prime fast, and although my box looked like it had been chucked off a building, the bio rings were all intact! Love this addition to my sump and will definitely be ordering more in the future!

Purchased for my 25 gal sump for my 75 gal tank. Seemed to help the accelerated growth of beneficial bacteria causing my aquarium to cycle faster. Good product for sumps and filters

The bio rings from aquarium co-op are doing a great job in my tank. They have me a great amount for a great price.

Bought these after watching the ungrading your filter video, received more that expected, great product!

Well the bio rings and bag have been tested and still in good condition

Bought these for established tanks. I had to split the rings into two media bags to fit my HOB filter, but they have acquired loads of biofilm in the week since I did that.

They were a too big to fit in my filter, so I had to cut the bag open. However, they are very porous and hold a lot of bacteria.

Good quality but the balls are too big

Excellent!! Fast shipping and packaged nicely!

Great product

Great product.

Filter is updated and working great!! Love this stuff

Awesome product.

I've used similar materials in the past. I bought these to set up a new nano tank for my office.The beauty of these is that there is almost no need to ever replace them!

Until I go to rinse out my filter I forget these are even there, but have had much more tank stability since adding

Love everything from Aquarium Co-oP!! Made with great care for hobbyists by hobbyists.

I underestimated the amount of BIO Rings I would receive per box. The value is fantastic and the prepackaged rings fit great in both my Fluval 307 and 407.

These seem to be a bit more porous than fluval biorings. They seem to work a little better too 😉

I put in a big order for these. I was setting up multiple canisters, and topping of all my hang on back filter media. Typically when you order these from a company they come in a beat up plastic bag with dust everywhere. Or a box with a dust that coats everything. I like how these are boxed and bagged to keep everything clean during delivery and storage.

Product is also great. You can use it in the flow through back it comes in or cut it open and add loose to your canisters. The bag it comes in makes it easy to clean. I put water in a pitcher and violently shake and swirl it in the water until the mulm comes off.

A ton of thought went into this product and it's packaging and it is appreciated.

Love these in my Hang on Back filter!

Bio Rings

i have a very long 33g tank (48" long to be exact) and i have one HOB on each end. i needed some stronger media to combat the mulm building up, and this did the trick! have been using it in multiple other tanks as well and it's been great!

These BIO RINGS fit perfectly in my Seachem Tidal 75. With the provided mesh bag, it makes cleaning super easy, and I can spend more time enjoying my aquarium!