Cylindrical Air Stone Pack

🪵 Cylindrical air stones: oxygenate your roots with finesse

Dissolved oxygen is the number one limiting factor of a successful hydroponic grow. The more oxygen-saturated the solution, the better the roots breathe, the more nutrients they absorb and the faster the plant grows. Air stones are the basic tool to reach this saturation: paired with an air pump, they turn an air flow into thousands of microbubbles that stay suspended long enough to transfer their oxygen to the water.

Growrilla stones use a particularly fine grain that produces bubbles under 1 mm. Compared with a standard coarse-bubble stone, the oxygenation yield is up to 40 percent higher at equal air flow.

📊 Technical specifications

• Quantity: 10 stones per pack
• Sizes: 50 x 50 mm (diameter x height) or 100 x 50 mm
• Fitting: 4 mm barbed for standard silicone tubing
• Material: fine-grain sintered ceramic
• Recommended air flow: 100 to 300 L/h per stone
• Lifespan: 6 to 12 months depending on water hardness
• Country of origin: Italy

🎯 Which size to choose

The 50 x 50 mm size is the standard supplied with Growrilla RDWC 2.0 and PRO kits. It fits in a 19 L bucket and works with the stock Hailea ACO 9602 air pump. For preventive replacement (stones clog up over the months), the pack of 10 covers an 8-bucket kit for about a year.

The 100 x 50 mm size is meant for large volumes: buffer reservoirs, aquaponic tanks, mixing tanks or oversized grow buckets. A more powerful air pump is needed to get the most out of them (250 L/h minimum per stone).

🧽 Stone maintenance

A healthy air stone produces a dense cloud of uniform microbubbles. When the bubbles become large and irregular, the pores are clogged with mineral salts.

The fix: soak the stone in distilled water + 1 ml of food-grade citric acid for 30 minutes, then brush gently. If after two cleanings the output does not come back, it is time to replace.

💡 Pro tips: optimising oxygenation

Golden rule: 1 stone per grow bucket, placed at the bottom so the bubbles rise in a column along the roots. In a mixing tank or buffer reservoir, fit 2 to 3 stones in parallel to cover the whole volume.

To go further: feed each stone with its own line from a distribution manifold rather than in series. You guarantee equal flow on all stones and easy individual disconnection.

Growrilla is an Italian manufacturer of soilless growing systems, based in Robassomero, in the province of Turin. The brand has been designing and manufacturing its own RDWC, DWC, Oxy Ring and NFT systems since 2014, in a 100 % Italian workshop.

Its technical signature : a double-walled bucket with an anti-algae black interior and a reflective white exterior. All parts are produced and assembled in Italy, with 32 mm push-fit fittings for the 2.0 line and 50 mm for the PRO line. The systems are covered by a 2-year manufacturer warranty.