uxcell Black Mineral Bubble Air Stone Diffuser for Aquarium Fish Tank Pond Pump

For the past 3 months, I have been using this to make worm tea in a 50 gallon drum. It is heavy enough to sink to the bottom and stay in position while stirring the tea. The squared ends protect it from the fine sediment that clogs other airator stones. It emits very fine bubbles and I think it's heavy duty enough that it will last for a long time. I have finally found a replacement for all the airators that clogged, ones that kept surfacing or were too light and others that became waterlogged and broke. I am very pleased.

These work well so far with my eheim 200 air pump Have one connected to each port. A larger air pump would be better but it works for my 75 gallon tank. Produce air around most of the stones. Heavy enough to stay on the bottom. Nipple will fit two different sizes of tubing.Update: Purchased eheim air pump 400 air pump. Works very well with two of these stones. Produces LOTS of fine bubbles around complete stone.

Leaks around the square plastic. I took the top off and used silicone to seal it. When it dried and i tried using it again, the bottom leaked. Bubble are huge and very few actually come out of the stone. The silicone worked until the pressure opened up the seal on the plastic again.

Produces a ton of bubbles. A little hard to hide the air tube since it's about an inch above the gravel. All in all does a great job.

Great air stone with lots of small bubbles. I was worried that this air stone would clog up after a few weeks like others and just start creating those huge bubbles but it has been going constantly for about a month now with very little reduction in flow. It is a little bigger than I expected it to be but worth the size it takes up. The fitting on it is a very nice high quality one that has stayed in great shape and holds mt python air tubing like a champ.

Despite being connected to a 16L/hr air pump, this stone only produced bubbles just behind the plastic end next to the intake. In addition, it leaked around the intake. Because the 'housing' is plastic, I did not attempt to tighten the fixture. Seriously disappointed.

Bought 2 of these. One works fine, on the other bubbles only come out of the first 1/4th of the stone. Also much larger than I anticipated. I kept the one that works in my 30 gallon, but you couldn't do anything sly with one of these in a tank much smaller or without a ton of substrate/items to bury it. Seller doesn't accept refunds on this item but Amazon gave me my money back for the defective airstone. Will keep the one that works in my tank since I managed to hide it, but would not purchase again. There's smaller airstones that will do the same thing.

At first, I was concerned about one review mentioning "bubbles only on one end", which is was the initial problem I had. However, I discovered, that the air pump I was using had a very small air output rating, and that was the problem. So I ordered from Amazon, the Fluval Q1 Air Pump (which has two air output valves). What a difference! Now I have a significant amount of bubbles coming out of this air stone. I recommend it, just make sure you have an appropriate-sized pump.