Lasting clog-resistant performance ensures proper aquarium aeration. Silica Airstones feature a uniform pore structure for low airflow resistance AND resistance to clogging. The result is even and reliable bubble production for proper aeration (gas exchange) with little or no maintenance. Perfect for use with air pumps. Self-weighting when used with typical tubing lengths. Machined from a solid block of glass-bonded silica. Small measures 1-1/2" x 1/2" x 1/2" and Medium measures 3" x 1" x 1". Airstones, curtains, and diffusers require an air pump and airline tubing for use (sold separately).
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