JW Aircore Sand Airstone - 1 in.- 4 pk
Aircore compressed sand airstones have a unique shape and durable construction for even air distribution.
Attach the Anchor Stone to the airline tubing of your air pump. Be sure that the pump is turned off.
Place the airstone in the aquarium.
Cover the plastic Anchor with gravel to keep the airstone from floating.
Turn on the pump. To regulate the airflow use an aquarium air valve or gang valve.