Pawfly Large Air Stone Cylinders 4 x 2 Inch

Silicon carbide, not mineral stone, makes up these cylinders, and the material takes washing. Each one stands 4 inches tall and 2 inches across, weighs 0.8 pound and stays upright on the bottom. Model ASC100 passes 5 L/min, roughly 79 GPH, through 3/16-inch tubing and calls for a pump above 7 W, while dense bubbles rise from the micro holes along its sides.

Packs hold 2, 4 or 8, which covers a pond with several aeration points or a row of grow buckets. Give each cylinder its own outlet or valve, because a 7 W demand per stone adds up fast on one pump. Soak the stones for an hour before the first run and brush them when the stream thins.