Active Aqua Air Stone, Cylindrical, 2" x 2"

Aerate Hydroponic Nutrient Solutions With a Medium Cylindrical Air Stone

Maintaining adequate dissolved oxygen in the hydroponic nutrient solution prevents root zone problems, slows nutrient degradation, and supports consistent plant development. Air stones diffuse air into the solution in fine bubbles — the micropore design maximizes the surface area of each bubble for efficient oxygen transfer.

The Active Aqua medium cylindrical air stone — 2 inches in diameter and 2 inches long — the medium of the three Active Aqua cylindrical sizes — a versatile choice for mid-size DWC and recirculating reservoirs. The cylindrical shape distributes bubbles along the full length of the stone, making it effective in taller or more compact reservoir configurations where a flat disc stone may not provide even coverage.

Key Features & Benefits

• 2 x 2-inch cylindrical format — The medium of the three active aqua cylindrical sizes — a versatile choice for mid-size dwc and recirculating reservoirs.
• Micropore diffuser construction — small, consistent bubbles from the full cylinder surface maximize air-to-water contact for efficient oxygen transfer.
• Cylindrical distribution pattern — bubbles emerge along the full length of the stone, providing more even vertical distribution in taller or narrow reservoirs compared to flat disc stones.
• Versatile mounting options — cylindrical stones can be oriented vertically or horizontally depending on reservoir geometry and tubing routing.
• Extends nutrient solution life — continuous aeration reduces pathogen risk and slows nutrient degradation, extending the usable life of the reservoir solution.
• Compatible with standard air pump tubing — connects to any standard air pump outlet via flexible air tubing.

Who Should Use the Active Aqua Medium Cylindrical Air Stone

Hydroponic growers running DWC, RDWC, NFT, or recirculating systems who want cylindrical air stone aeration in a medium size — 2 x 2 inches — for reservoirs where cylindrical distribution suits the container geometry.

Round vs. Cylindrical Air Stones

Round disc air stones distribute bubbles in a radial pattern outward from the disc surface — well-suited for flat-bottomed reservoirs where the stone lies flat. Cylindrical air stones distribute bubbles along their length — better for tall containers, compact buckets, or anywhere vertical distribution is preferred. Active Aqua offers three cylindrical sizes: small (1.4 x 1.7"), medium (2 x 2"), and large (2 x 4").

Frequently Asked Questions

How do I choose between the small, medium, and large cylindrical air stone?

Choose based on reservoir volume and air pump capacity. The small (ASCS) suits individual buckets or smaller reservoirs; the medium (ASCM) is a versatile mid-size option; the large (ASCL) provides more diffusion surface for larger reservoirs. You can use multiple stones in a single large reservoir.

What air pump do I need for cylindrical air stones?

Any standard hydroponic air pump that provides adequate flow rate for the number of stones in the system. Allow at least 0.5–1 LPM per stone, increasing proportionally for larger systems.

How do I orient the cylindrical stone in the reservoir?

Both horizontal and vertical orientations work. Horizontal placement along the reservoir floor provides even coverage across the bottom; vertical placement is useful in tall, narrow containers where horizontal placement is not practical.

How often should I clean or replace the air stone?

Clean the stone when you notice reduced bubble output by soaking it in diluted hydrogen peroxide (3%) or clean water to dissolve mineral buildup. Replace when cleaning no longer restores normal flow.