Airstone Sphere 4 cm ZOLUX – aquarium air diffuser stone

The ZOLUX Airstone Sphere 4 cm is a spherical aquarium air diffuser stone designed to generate fine, consistent bubbles to improve oxygenation and water movement in freshwater and marine tanks. Compatible with standard air pumps and flexible tubing, this 4 cm airstone promotes even gas exchange and helps maintain a stable environment for fish, invertebrates and aquatic plants. Its compact spherical shape allows easy placement on substrate or within decorative hardscape without dominating tank layout.

Advantages

The spherical airstone produces a uniform stream of fine bubbles that increases surface agitation and oxygen transfer without creating strong currents. Made from porous material, it resists clogging under normal aquarium conditions and provides prolonged, steady aeration when used with an appropriate air pump. Its small 4 cm size makes it suitable for discreet installation in small to medium tanks and planted aquaria where gentle water movement is preferred.

Suitable for

• Small to medium freshwater aquariums
• Planted tanks that require gentle circulation
• Marine and reef setups for localized aeration
• Quarantine or breeding tanks where oxygenation is critical

Key specifications

• Shape: spherical (ball)
• Diameter: 4 cm
• Material: porous diffusion stone (ceramic/airstone composite)
• Intended connection: compatible with standard airline tubing via rigid or flexible tubing and airline fittings
• Application: air diffusion for oxygenation and water circulation in aquaria

How to use

Attach the aquarium airstone to an air pump using suitable airline tubing and any required check valve or flow control. Position the 4 cm sphere on the substrate or secure it under a decorative element; ensure tubing is routed to avoid sharp kinks. Start with a moderate air flow and adjust pump output or use an inline air valve to achieve the desired bubble density and water movement. Regular observation of bubble production and tank conditions will indicate when maintenance or replacement is needed.

Usage recommendations

Periodic cleaning can extend the functional life of the airstone: remove it from the aquarium and gently scrub with a soft brush under running water to clear surface deposits. Do not use soaps or chemical cleaners. Replace the airstone if bubbles become large and irregular or flow decreases significantly, as this indicates internal clogging. Match pump output to the airstone size to avoid overworking the pump and to maintain efficient, fine-bubble diffusion.