Ziss Adjustable Air Stone

work great, best I have used in 55 years keeping fish aquariums. very easy on air pumps.

I had 2 for years, and now I have 4 going. I’ll never use the cheap air stones again.

Ever since I installed this airstone with one of my sponge filters from aquarium co-op, I no longer hear the loud popping sounds from large air bubbles as before. Easy to clean and easy to adjust the desired bubble size. A must buy !!.

I find this so easy to adjust the airflow right from the stone itself. Easy to clean if need be, but I doubt it will get clogged.
Definitely need a few more

When I heard Cory hyping these up I was honestly a little dubious. I didn't realize how much of a difference a better air stone can be! This makes far finer bubbles with less noise than any of my previous ceramic stones, and is easier to keep at the bottom of the tank. I doubt I will be using anything else going forwards.

I have found these to be the perfect air stone for mu Aquarium CO-OP awesome sponge filters. I clean them up at the same time I clean the sponge filter. I like to check the filter pad in the air stone at that time as well, check to see if the vent thingy needs to be changed or at least rinsed off.

Keeps bubbles nice and small, prefect match for the sponge filter

They used to be called never clog. What a joke. This is literally the biggest piece of junk I have ever bought for an aquarium. It never makes it 2 months before it clogs. Constantly have to make adjustments to work properly. Then the coop tubing gets stretched out from constant adjustments so you have to cut the tubing. It's a nightmare, after a year of fighting with this I threw it away. False advertisement as you can now see they changed the name. Avoid at all cost.

This is the perfect airstone. It's incredibly useful being able to adjust the size and rate of the air bubbles with just this airstone. It's small but has amazing flow. It's not messy, and doesn't degrade nor crumble like the traditional airstone. I wish they sold the green spacers individually though. It does eventually clog!! Espically if you take it out of the water, let it dry, and try to use it again. It'll be completely clog. But that's a small thing, and it comes with extra green spacers.

I am a rabid ACO supporter but I'm really surprised by these. I even loosened the threaded portion to get better water movement and they clogged a month later. This is the only ACO product I've ever scratched my head about. It certainly won't discourage me from ordering from them in the future.