Review on Bubble 3 Piece Aquarium Hydroponics Connectors by Dan Husband

I soaked the whole thing in water for 2 hours before turning on the pump (the instructions say soak for an hour). When I turned them on, the first one worked fine. I have blisters like they should. The second time only very small bubbles came out of the stone. I tried cleaning it, taking it out and blowing air through it to clean out the innards, then reset it for another hour and it worked for a bit. Now it works at about 1/3 of what it should be. After about 2 weeks I got tired of it and just stuck a small circle of bubbles on it until I found a replacement. The third stone worked at about half power. There's nothing I can do except make it work better. I probably won't buy them again and actually went to my local fish store and bought replacements for two of them. I hate that I spent my money on this.