6" Round Grey Airstone — Large Hydroponic Airstone

6" Round Grey Airstone — Large-Capacity Hydroponic & Aquarium Airstone

A substantial 6" round grey airstone for freshwater, saltwater aquarium, and hydroponic use — designed to increase dissolved oxygen levels efficiently through fine bubble generation. Large surface area produces fine bubbles across a wide area, making this highly efficient at oxygen exchange in fish ponds, aquarium tanks, or DWC reservoirs.

Why growers choose the 6" round airstone:

• Large 6" diameter — substantial surface area, more bubbles per pump output than small stones
• Fine bubble production — maximum oxygen exchange efficiency
• Increases dissolved oxygen levels — critical for DWC root health and pythium prevention
• Works in freshwater and saltwater — universal application across pond, aquarium, and hydro
• Efficient oxygen replacement — keeps reservoir O2 levels high for healthy roots
• Fits standard air pump tubing — universal 6mm airline compatibility
• Durable ceramic construction — lasts many grow cycles with regular cleaning

Who it's not for:

For smaller propagation reservoirs, a 4" round airstone is more appropriate. Match to your air pump output — large airstones need matching pump capacity; undersized pumps produce weak bubble output. Clean every 4-6 weeks with a bleach soak to prevent mineral-buildup clogging; if bubble rate drops noticeably, it's cleaning time.

In stock now — ships same working day from our Staffordshire warehouse with free UK delivery over £100. Pick up in-store at our Stone shop (ST15 0SR) if you're local, or click & collect at checkout.