Active Aqua Air Stone, 6" (15 cm), case of 12

Maintain Dissolved Oxygen Across Multiple Reservoirs With a 12-Pack of 6-Inch Air Stones

In multi-site hydroponic operations — rooms with multiple reservoirs, ebb-and-flow tables, or commercial RDWC systems — keeping dissolved oxygen levels consistent across all sites requires a reliable supply of air stones. Buying individually creates inventory gaps; buying in a case ensures you have replacements on hand when needed.

Active Aqua 6-inch air stones use a micropore diffuser construction that produces fine, consistent bubbles for efficient oxygen transfer. The 6-inch length provides a larger diffusion surface than the compact cylindrical stones, making each stone effective across a larger water volume. The case of 12 is suited to operations that run multiple reservoirs or stock replacement stones for the grow cycle.

Key Features & Benefits

• 6-inch (15 cm) length — larger diffusion surface than compact cylindrical stones — distributes more bubbles per stone across a larger section of the reservoir.
• Micropore diffuser construction — fine pore structure produces consistent, small bubbles for efficient dissolved oxygen transfer.
• Case of 12 units — bulk packaging for multi-reservoir operations or to maintain replacement stock throughout the grow cycle without reordering.
• Aerates and circulates nutrient solution — continuous aeration keeps the solution moving, reducing stratification of nutrients and temperature zones within the reservoir.
• Compatible with standard air pump tubing — connects to any standard air pump outlet — no proprietary fittings.

Who Should Use the Active Aqua 6-Inch Air Stone Case

Hydroponic operations running multiple reservoirs or commercial RDWC systems who need a reliable supply of 6-inch air stones — either for simultaneous installation across many reservoirs or to maintain a stock of replacements for the grow season.

How Many Air Stones Per Reservoir?

A single 6-inch air stone is adequate for most single-bucket DWC or smaller recirculating reservoirs. For larger reservoirs or RDWC systems, use multiple stones — one per bucket in multi-bucket RDWC, or 2–4 per large single-tank reservoir depending on volume. Ensure the air pump's total flow rate is sufficient for the total number of stones in operation.

About Active Aqua

Active Aqua is a hydroponic equipment brand distributed through Hydrofarm's catalog, and its air stones are engineered alongside the brand's own air pumps and tubing as a matched aeration system. Selling the 6-inch cylindrical stone in a 12-pack reflects how the brand supports operations running many reservoirs at once rather than a single grow space.

Frequently Asked Questions

Is this air stone sold individually or only as a case?

The AS6 product is sold as a case of 12 units. If you only need one or two stones, consider the individually sold Active Aqua round air stones (AS4RD or AS8RD) or cylindrical sizes.

What is the pore pressure rating for this air stone?

The AS6 is rated for standard air pump pressures used in hydroponic operations. Refer to the product packaging for the specific pressure specification for this model.

How do I clean 6-inch air stones used in a nutrient reservoir?

Soak in diluted hydrogen peroxide (3%) or clean water to dissolve mineral deposits. Replace stones when pore output cannot be restored by cleaning.

Can I use this air stone with any air pump?

Yes — the stone connects to standard flexible air tubing and is compatible with any air pump that provides adequate flow at the stone's operating pressure range. Match pump output to the number of stones running off it, since an undersized pump reduces bubble output across the whole line.