Apollo Horticulture AH AS-4 4" Round Air Stone, 4 Inch

Before I bought these I thought something was wrong with the air pumps I had but once I set these up it turned out that the old bubble wands was the problem. These air stones work very, very good. I bought just one at first but then bought 3 more after I saw how much better they are then my old setup. They are circulating water for sure and would buy more of these if needed.

I bought three of these air stones at one time. I'm not sure if it was in shipping or before they shipped it but two of the three had broken nipples so they are useless paperweights now. The stone that still works. Worked great after I soaked it for about a half an hour like it says you should do.

air stones used for hydroponic set up - they do not stay on the bottom of the container, but float around - I had to put rock on them to keep them on the bottom.

I also have the rectangular one tested side by side...and this one seems to make smaller bubbles (puts more air in the water).It is working pretty good.

Good quality

This air stone works great for DWC hydroponics! Lots of bubbles

This is as good as it gets right here. Although, the suction cup it come with only stays suctioned on the bottom of my DWC bucket for about 20 minutes. Then it turns upside down. Still the air stone itself is durable and worth it. #HopeThisHelps!

I had ordered four of these stones and three of the four work very well. The forth one was broke when it received. Hopefully this helps.

Use in my fish tank and looks great! Small 20 gallon air pump but still get uniform bubbles throughout and no leaks. Great!

Fast shipping, just what i needed. works well.

works as advertised

Very good product, just a little problem with it, it floats when the air is injected into it.I had to attach a rock to it to get it to sink to the bottom.Otherwise, it is fine.