Review on 🐠 VIVOSUN Air Stone: 2PCS 4 X 2 Inch Large Air Stone for Aquarium and Hydroponics - Boost Your Pump's Performance! by Heather Johnson

This is complete bullshit. I've tried them with a standard air pump and a 950gph industrial air pump and could only get huge bubbles to come out of the top of the unit. I even put it on its side and no luck. I read in another review where someone used Apoxy to seal the top to fix this. I did not purchase this item brand new just to be able to repair it! .Simply put. They just don't work. I get the same effect by just dropping the airline into the water.