AquaTec manufacturer's its own fine bubble disc and tubular diffusers (a USA product); and AquaTec designs and builds custom aeration systems of all types... using both fine bubble and coarse bubble diffused air configurations... AquaTec is one of the pioneer USA manufacturer's of fine bubble membrane diffusers. If you need a more efficient and reliable system; AquaTec has the expertise and equipment that can address your needs... Call AquaTec today.