Aquacadabra Aqua-Jet 900 Aerator Ring - Pond Oxygenator Air Stone & Air Line

Can't fault it at all at the moment, weighted down perfectly and produces a perfect ring of fine bubbles. Obviously, like any aerator, you will need adequate air pump pressure in relation to pond depth as this item is nearly the size of a dinner plate. Would give 5 stars but waiting to see how it ages underwater.