"The Airstone allows oxygen to dissolve into water by breaking a stream of air into thousands of tiny bubbles, which can be a critical component in the successful aeration and health of a pond or lake. Accessory Type Diffusers and buckets, Includes qty. 1, Application Oxygen dissolves into water, Product Type Windmill accessory, Material Type Airstone, Size in. 7, Compatible With Pond, lake. This is critically important in any climate with below-freezing temperatures"
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