Pack of four fine bubble airstones. This order is for FOUR Air Diffusers, each is 6" L x 1.5" W, 3/8" O.D. barb (9 mm). Normal airflow range is 0.5 CFM. 0.75 lbs each. Self weighting when using normal tubing lengths. Build your own aeration system! Add a few of these in your pond, connect to your air pump and you have an efficient aeration system.


These are highest-quality ceramic-type air diffusers machined from a solid block of glass-bonded silica. Because dust and dirt particles up to 30 microns in size will pass right through these diffusers, there's no need for expensive air filters. And with an air resistance of less than .25 psi, these glass-bonded diffusers are compatible with economical low-pressure blowers. They produce a uniform medium/fine bubble and are very resistant to clogging. And when cleaning does become necessary because of a buildup of calcium precipitate or bacteria, an acid bath restores them to like-new performance. Made in USA.

With their round grain pore structure, low resistance to airflow, uniform porosity and resistance to clogging, these airstone diffusers are clearly the best diffusers available for general aquaculture aeration. Smaller pores don't necessarily produce smaller bubbles. These diffusers are engineered to produce the smallest bubble possible within the constraints of a reasonable service life. In most soft water applications, they won't need to be cleaned for more than a year. Note that water pH in excess of 9.0 will shorten the diffuser life. Self-weighting when used with typical tubing lengths.