Diffuser Airstone is the secret ingredient for efficient aeration! These 7" Stones are manufactured with a large base to ensure the stone is sealed to the base correctly, forcing air out of the micro-pores in the stone. If holes are too big, you will get big bubbles. If they are too small, you don’t get adequate circulation. This stone has proved itself for more than 20 years.

Airstone has a 1/2" MPT threaded connector.

Available with checkvalve or without.

Cleaning
Aluminum oxide diffusers are virtually indestructible (although they will break if dropped!) but need occasional cleaning. The frequency of cleaning will be determined by the  mineral and organic content in the water. On average, stones will need to be cleaned once per year, but could require as much as every few months.

1. Remove from the water and blow out remaining water. Scrape off any large debris.
2. Immerse completely in undiluted muriatic acid to dissolve any buildup. This time varies between one minute to eight hours in extreme cases. Be mindful when working with acid! Wear eye, face, and hand protection and have lots of clear water on hand for diluting splashes or spills.
3. Remove from acid and rinse thoroughly.
4. Dilute the acid with at least ten times as much water before disposing.