I have been using these air stones for over a year now and have had really good luck with them. They bubble really well and are adjustable as far as bubble size, I like the smaller bubbles so I tighten them up. I am using four of these inside sponge filters and have a couple inside different tanks as stand alone air stones. I've never had one clog completely yet. When the bubbles seem to slow I take them apart and change out the felt pads. I then soak the old pads in vinegar for a day or two, rinse and soak in clear water for a day. Let dry completely and they are good to reuse. Probably can go 3 months before I have to clean them. I am buying a few more for a new tank and to have on hand. Love these!

These are great air stones easily adjustable. Comes with extra felt to replace for longer life, great value. I buy them all the time.

I heard that the ones with blue foam never clogs, but these new green ones eventually clogs.
Its still a good air stone, the best i have ever used. But cleaning wasnt enough and i had to use the spare discs after a year.
The picture i posted its after 1 year of use, and I'm trying to get it clean

Been using these air stones for a little over a year now. I only use these now in all my tanks. Just ordered two more for my new set up in new 30 gallon aquarium. I'm running under gravel filters and these air stones are running in each one. And I use them on all my Aquarium Co-Op sponge filters in my small tanks. Will probably order more.

Still as good as day one, highly recommended.

I finally got some and their the best...! I used to those little $1 stones that'd been around forever and clog rather quickly, I've even had those not work straight outta the package... Anyway, I like em and will be replacing all of my 70+ tanks with these Ziss stones...I have a usb/Ziss stone combo that gets A LOT of air to 6' deep... PS: You will need an air pump to go with it though, they do not produce air by themselves...!!!

I am a big fan of Aquarium Co-Op for two reasons.
1.They sell quality products and stand behind what they sell with good information and great customer service.
2. I get so much excellent help by simple watching the informative and sometimes entertaining videos on their YouTube channel.
Thank you so much for all that you have done and continue to do to support the hobby. You guys really do help to make keeping fish and plants one of the most enjoyable hobby's I or anyone for that matter, can have. You minimize having to learn the hard way by explaining how and why certain steps are important and how to avoid wasting money. Keep up the good work and thank you for all of your taking the time!

I bought 1 18 months ago to go with me newly purchased medium sized sponge filter but thats another review,lol and I jjust cleaned it for the 3rd time and I still havent used any of the replacement pads ! By my math,that 3$ for what Id normally pay for 3 air stones BUT you cant clean an airstone.Not and get brand new quality like these,you cannot ! Plus the bugger is still going.So I ordered 2 more to go in that undergravel filter you see in the other pic.BUY THIS NOW !

I ordered this after a TON of research and watching of YouTube videos.
This little stone puts out a nice amount of bubbles and I love that the size of the bubbles are adjustable just by tightening down or loosening up of the pressure on the pads.

As an Aquarium enthusiast, professional aquascaper and 20 years knowledge in this hobby, I must say that this is the BEST air stone on the market! Other air stones block, get covered in algae and cleaning those can damage them. They also fall apart over time. This air stone is genius and I love how they come with replacement pads. These truly are the never blocking and never breaking air stones. I have bought so many already for all of my tanks, breeding tanks, and even my coral tanks. The fish love them. I love these air stones and will never buy anything else again :)

These airstones are far better quality than anything I could compare. Come with replacement discs and are worth every penny. Caught these in Corey's video and fell in love. Perfectttt with the matching aquarium co-op sponge filters. Will 100 percent recommend to every fish keeper.

I love theses I run 3 stones to power filters. The minute I traded out the old stones there was a noticeable drop in noise, and a could hear my ADFs singing across the living room without shutting off the air pump first.

I also like being able to get small bubbles while still cranking the air to full blast while dosing meds without creating a undertow and freaking out the ADFs.

I got this to put inside a small aquarium co-op sponge filter. I have it hooked up to a usb nano pump in one of my 29 gallon tanks. The small bubbles make it quieter. You can barely hear them and the bubbles are all you hear since the pump is so quiet. It’s much quieter than the old air stone I have in my other 29 gallon tank.

So far it works well👍

I installed the stone in one of the co-ops small sponge filters and it works well. Using it as backup filtration in my 20 gallon hex. Have it tightened down and it gives me good micro bubbles which is exactly what I wanted. Would recommend.

Great quality air stones! Perfect for my sponge filter- very pleased with my purchase!

Awesome! I like how you can adjust the size of the air bubbles and is perfect with the aquarium co-op sponge filter

This little air stone produces a good amount of bubbles. I only purchased because I read it was also well weighted too. To my disappointment, it’s very light weight and tend to float. My solution was to place a flat stone on top of it to keep it in one place.

I am using the Ziss never clog air stone with an Aquarium Co-op sponge filter and USB air pump, as I have seen enough of Cory’s videos to understand the benefits of this system. From my point of view, for very little cost investment, I’m getting high quality aeration and filtration. Plus the initial set up was super easy. I love that Cory has videos on YouTube to help with that, too.

I’ve never had an air stone perform as long and as efficient as these. I have been using them for 3 yrs now and they still work really great.You’re even able to adjust the air flow with a twist of the stone . Only purchased again because I’ve added more tanks to my collection and wouldn’t use anything but these never clog air stones. Thanks Cory for making quality products available to us aquarium hobbyist and thanks even more for the fast shipping! What a great company to deal with. So glad I found you from your very educational You tube videos!

Very interested to see how these hold up. I got two for the sponge filters I recently purchased. Small and sleek looking.