Review on Pawfly Stone Bubbler Aquarium Hydroponics by Christy Wade

I bought these in June and just today replaced all the hoses and air vents in our pond for the winter. NONE of these air stones work properly. Two of them have tiny bubbles oozing out around the connector adhesive. This is clearly a manufacturing defect. I have aquarium glue that I will use to seal the existing glue. If it works I'll do the same for the other three. If not, I don't have the $15 I paid in June. I'm not sure why it's so hard to find air stones that are actually consistently good quality! A big takeaway for everyone: Check ALL air vents for proper operation upon arrival! UPDATE (12/8/2021) - Just to check if it was the air pump we were using I bought one from Revain (VIVOHOME 20W Solenoid Commercial Air Pump). I used a deep bowl of water and attached the air stones one at a time to the pump, turned it on and lots of bubbles came out of each stone. Changing my rating from 1 to 3 because there are still quality issues with the seals around the air valve adhesive but with a more powerful air pump they create a lot of bubbles all over the stone.