ALEGI Air Stone Cylinder Bubbler for Hydroponic Systems,Aquarium or Fish Tank- 5.3 inch 2 Pack

These are much better for hydroponics than other products. They are heavy enough so that you don't need to clamp them down and they seem to last through several planting cycles.

They work good

Put a lot of oxygen in the water for the fish

Works good

These are so much better than the disks I used to have in our koi pond. The koi used to flip them over the disk kind and over time the plastic point where you attach the hose would break off. These are so much tougher amd it doesn't matter which way they land at the bottom of the pind. I wish I'd have bought them several years ago. I bought 2 sets. The price is great! Thanks!

Quality issue, seals on ends are not good, bubbles come out only at the square black end caps. They are Not glued on properly.

Puts out a lot of air. Built pretty sturdy too. Could use a little better distribution on the air, but its ok.

I don't know why it's so hard to find pond-sized air stones. It seems the manufacturers have moved to plastic "membrane" bubblers, but they really don't work for me and end up not blowing out of the length of the membrane. These stones work well, although the size of the inlet was small compared to my piping. I made them work by wrapping black tape around them. Once in the pond, I could see immediately that the bubbles were smaller and finer and the fish seemed to like them better. As you may know the idea of these is to turn the water over so that it oxygenates and I run my bubblers 23 hours a day.