PINVNBY 4.2-Inch Air Stone Disc Bubble Diffuser with Suction Cups for Oxygenation in Fresh/Saltwater Tanks, Ponds, Hydroponic, Aquaponics, and as a Decorative Airstone for Aquariums

I have a good sized air pump thats meant to handle a 150 gallon tank, so its not the air supply... Just dosen't produce bubbles like the picture at all.. Im not impressed at all with these air stones, would never buy again.. The bar air stone is much better, and try for hours to get these level and somewhat hidden, totally impossible, ill never buy two round stones again.. Use a air stone bar with inlets on both ends,, they work 100 times better

I purchased 4 of these air stones in March while building my hydroponic system. I had to step away from the build for about a month, but decided today to wrap everything up. When installing the air stone the nozzle broke off without any pressure against it. The airline was attached and the. It was placed in the bottom of the system. The air line immediately moved to the top of the system while the rest of their air stone remained at the bottom. There is no replacement part as it looks the whole plastic portion of the air stone is one piece.

I'm not sure why there are so many negative reviews, but I hooked these up yesterday, they are working just fine. I like the fact they have suction cups so I can stick them to the bottom of my 125 gallon aquarium. I did purchase the Hygger Adjustable 160GPH 5W Aquarium Air Pump Dual Outlets (4mm), and not only is it insanely quiet, but you can adjust the airflow and on high, the bubbles are just what I wanted from my tank. The price is good for 2 of these in the pack, and I would definitely purchase these again.

Pros: They're not terrible.Cons: Large bubble size. Too light to use without suction cups, and suction cups are a pain to use and can be hiding spots for bacteria growth in DWC. Straight airline connector instead of angled. Kind of expensive.

Noticed right away that it didn't look washable like description says... put it in fish tank, seems to work OK, not as many bubbles as expected.. Only reason I went with these over so many others, was the washable feature.. Not happy at all...

One of the discs works great the other not so much both on same size pumps and one has half the bubbles

Got it in a 40 gallon tank pump large bubbles only was hoping for different effect but alas amazon products are a shot in the dark

Love the 3 suction cups, they hold well. I purchased two of these, as I didn't want a large airstone on the bottom of my tank any more, I actually mounted them both on the back wall of my aquarium and they look nice, made a lot more room for my discus and produce quality bubbles. Im happy with the purchase.