Active Aqua Cylindrical Air Stone - 2" x 2"
Oxygen depletion in a hydroponic reservoir happens gradually and silently — dissolved oxygen levels drop, root zones become anaerobic, and plant performance deteriorates well before the cause becomes obvious. The Active Aqua 2" x 2" Cylindrical Air Stone provides a consistent, targeted stream of fine bubbles through a micropore design that energizes the solution as it aerates, circulating nutrients while maintaining the aerobic conditions that healthy root systems depend on. At 2" long by 2" in diameter, it's the medium option in the Active Aqua cylindrical lineup — offering more output than the compact 1" models while remaining suited to single-bucket DWC systems utilizing the
Active Aqua Grow Flow expansion bucket, smaller reservoirs, and any application where a tightly focused vertical bubble column is more appropriate than the broad horizontal coverage of a disc stone like the
Active Aqua 4" round air stone.
The cylindrical form factor is particularly effective in taller, narrower containers where the vertical bubble column created by the stone's profile covers the full water depth more efficiently than a flat disc sitting on the floor. Micropore construction produces fine, consistent bubbles that maximize surface area contact between air and solution — the key variable in effective oxygen transfer. The ¼" tubing fitting connects directly to the
Active Aqua black vinyl tubing used across the Active Aqua air pump lineup without adapters, making it a natural pairing with any pump in the series from the 2W single-outlet model upward.
For growers running multiple sites, using an
Active Aqua 12-outlet air manifold makes it easy to position one stone per bucket without competing for interior space with root systems or net pots. As with all submersed air stones, an inline check valve on the airline is strongly recommended to prevent nutrient solution from back-siphoning into the pump body during any power interruption — particularly important in always-on continuous aeration setups where the pump and stone waterline relationship doesn't change between cycles.
