Review on 🐠 VIVOHOME 4 x 2 Inch Air Stones, Airstones Diffuser for Aquarium Fish Tank Hydroponics Pump (Pack of 2) by Jasmine Penny

All air comes from end of fitting like many other reviews say. I haven't read all the reviews, I've only seen that the overall rating was good, but obviously the quality varies significantly and they look exactly like the photos others have posted with all the bubbles coming out of the adjustment. I soaked them for hours before using them and tried everything I knew but they should just work, they don't. I can still return them. I used a 40 gallon aquarium pump for a rock.