Alumina Air Stones are 3 times stronger than silica.  Alumina produces finer bubbles without an increase in pressure drop. Higher density results in self-weighting and self-ballasts.

• More resistant to ozone.
• Three times stronger than Silica.
• No bonding agents to breakdown when cleaned.
• Engineered for minimal air flow resistance for low pressure blowers. 
• Resist fouling and clogging in either indoor or outdoor applications.