I was looking for an air stone that could adjust to small bubbles. It didn’t seem to make a difference no matter how hard I twisted it. Otherwise, it produces a decent amount of air bubbles.
I changed the substrate of my tank to sand, and after a few days the old airstone clogged. I replaced it with ziss air stones. I tried adjusting the bubble size for smaller size bubbles, but they are kind of medium sized so far. I will see how long this one works.
Exactly what I was looking for to use in my sponge filters
They are working beautifully as described. I didn’t realize that they were somewhat adjustable which was a surprisingly nice feature.
Liking the design and perfect for my sponge filter.