These are the best air stones out there. They are weighted so they naturally sink. They can be taken apart so that if they were to ever clog, they can be cleaned. At 10+ years of using these I've still never had one clog. They have medium sized bubbles which create very low back pressure which doesn't wear out your air pump and they work great inside sponge filters. Really they are the best air stone money can buy. Instead of replacing A cheap ceramic air stone every 4-6 months as they get worse and worse for bubbles, install one of these once and never worry about it again.
These things are great. I have been using them about 8 months now and I have never had to clean one, never had one fail, and never had one break trying to take it off the airline. spend a few extra bucks and save yourself some frustration, buy these guys!
This is a good no maintenance required tool. The bubbles are large, but i enjoy the look and the no maintenance requirement.
So far it has done well. I have it in my sponge filter.
Great quality airstone
I won't use another air stone again. This never clogs are awesome! Highly recommend them! Thank you Aquarium Co op!