Pawfly Aquarium 4 Inch Air Stone Disc Bubble Diffuser Release Tool for Air Pumps Buckets Fish Tanks Ponds DWC Reservoirs and Circulation System - 4 Pack

I got a 2-pack of these air stones for my hydroponic vegetable garden and they work great, my plants have taken off with the oxygenated water.

Work well. If you have low/poor output your pump is most likely the issue. I had poor output so I tried a different pump and it was night and day difference. Pic is after swapping pumps

They work pretty good but not perfect. It doesn't put out as much bubbles as the air stone cylinders because it has less surface area but it puts out enough for what its being used for. The rubber suction cups dont stay on tight and will fall off if moved. Customer service was quick to respond and very helpful. Thank you Pawfly

Great

Yep

I've wanted to buy an air disc forever and finally ended up giving this one a try. I was surprised at how big they were, which is the only positive thing I am going to say about these because I am honestly disappointed for a coupler reasons. Mainly because it only puts out the bubbles in a small portion of the disc, which is not what I was expecting. I was expecting it to look like the pics and be a full round circle of bubbles, but that is not the case. The other thing is that the suction cups it comes with are made so that the disc kind of snaps into them, but if they get bumped they easily come loos and I have crazy axolotls so it's always getting bumped and then I have to replace it... just annoying. I do not know if mine is faulty but I did try two different air pumps in case it was the strength that was the issue but both of them did not allow the bubbles to be fully around the disc and still only put out a small portion of bubbles which makes it look silly. :(

The media could not be loaded.  ordered the 2-pack and both discs are defective. when connected to the air supply air gushes out of a nearly imperceptible crack in the front edge of the housing (between the inlet barb and the blue disc material) and no bubbles come out of the disc material. however if i put a finger over the leak area and press firmly the disc works as intended and many little bubbles are generated. it seems this is probably due to a flaw in the manufacturing process. i think that when they install the inlet barb into the housing they are slightly too large for the orifice and cracked the housing causing the massive air leak. aside from this they are a very nice looking piece in every other respect. good weight, no sharp edges, the bead of black silicone on the inner rim is laid down cleanly, the suction cups work well, the barb fitting seems to be of high quality, no weird smells or residue, and the airstone component (the whole point of the item) seems to work very well (again when the leaks are covered). too bad. note: these were tested on a tetra whisper 60 (4W) and a hygger 16L/min (10W)

I bought two. One of them works great and the other one only bubbles from a little more than half the stone, which other reviewers have also said. Still plenty of bubbles. These are fairly large, which I was happy about. Suction is great. My mystery snails like to climb on them. For the price, can’t beat it honestly. If they stop working, I will update my review.