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After searching long and hard for the best air stones to use with DWC, we decided that Alita's fit the bill. They are virtually indestructible and clog proof. The 9" air stone to be unmatched in bubble production.
Durable, washable, reusable, air diffusing media
Constructed with brown Adamantine Spar (corundum/alumina) under extreme pressure and temperature
Can be used in alkaline or acidic waters
Suitable for deep-water culture, hydroponic, aquarium, fish hatchery, koi pond, and aquiculture applications.
***Note: The 9" air stone is too long to sit flat on the bottom of a 5-gallon bucket with a line attached. If this is your intention, please use the 4" or 6" air stone.