VIVOSUN Air Stone 2PCS 4 x 2 Inch Large Air Stone for Aquarium, Fish Tank and Hydroponics Air Pump

They work great!

These are best. They put out great micro bubbles but most important to me: even full of air they sink to the bottom and stay there

Great product

These are tough airstones. I am amazed that they still work at all after the beating they took in shipping. Bashed so hard, they were knocked free of the factory cardboard packaging. Some chips were knocked loose. Amazon put these heavy, brittle stones in an oversized, non-padded plain manila envelope. That's no way to treat airstones. Isn't Amazon supposed to be in the shipping business? Fail.

Bought 3 of these and using them in 5-gallon buckets with a 20w commercial air pump. They work exactly as expected and well-constructed (the barb and the glue that holds the barb adapter to the stone). Very satisfied with the product.

These work great. I get 10 million bubbles in my buckets. More oxygen for the plants. Very cool. Not much noise and I didn’t detect any odors.

there's not much to say, they do the thing. These are a nice size for a small fountain/koi pond and and a decent air pump. I used these to aerate the corners of my pond that the waterfall doesn't churn up enough. Good amount of airflow through the stones means less work on your pump.

received in mediocre condition was a great price hopefully my next air stone set doesn't come like this, when i got them only 1 had a cover on the hose inlet, the hose inlets are bent and ones chipped around the top of the stone hopefully they're usable still

Massive air-stones, using them to keep my water reservoirs oxygenated. Had to switch out a massive Hagen pump for one of the cheap Amazon adjustable pumps I had kicking around. These need some decent air flow to make them work... I would recommend these all day long...

love these air stone

Overpriced but with a quality pump they work really well.

I've tried the VIVOSUN, Pawfly, ActiveAir, and an assortment of smaller variations (I learned after a while to stick with the 'pop can' versions for DWC Hydroponics). The VIVOSUN stones seem to distribute the smallest, finest bubbles over the greatest area. I commonly use one stone per bucket, but I recently ordered more and added two per bucket. Growth has exploded. I didn't really expect it would make much of a difference and I just wanted to make use of an extra air pump I had, but the results are undeniable. So, in short, order a few extra and double down. At this price you can't go wrong. Noob note - never wash with soap and the put stone in reservoir. You will be giving your plants a bubble bath. Soak stones in ph water before use.

Perfect size and shape for DWC buckets! Plus there heavy enough not to float around on u like some of those bogus discs! On my 4th grow wit em and there as new! Haven't degraded or snapped at the airline tubing fitting like I find other models do! Also has great threaded tubing fitting for a really great seal! Best air stones I've had and believe me I've had plenty over the years.