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Coarse bubble diffusers eliminate clogging in wastewater systems while maximizing airflow and mixing capabilities. Operators often use these as alternative methods to fine bubble diffusers, which are efficient but more susceptible to plugging risks. With ReliaBall™ coarse bubble diffusers for sale from SSI Aeration, users will be more equipped to handle challenging industrial applications that require durable treatment solutions.


Coarse bubble diffusers are most commonly used in secondary treatment applications, where substances such as sediment and carbonate can build up quickly. The growth of these materials can be detrimental to fine bubble diffusers, which have smaller openings that plug more easily.

Engineers and operators often choose coarse bubble diffuser solutions for applications that require more space and larger openings. These uses may include aerobic digesters, grit chambers, sludge holding tanks and equalization basins.



The SSI Coarse Bubble Diffuser System is called ReliaBall™ for a reason. It combines engineering excellence, superior component quality, and a technically advanced product design. Proven highly durable and efficient in thousands of municipal and industrial installations around the world, SSI Aeration’s ReliaBall™ is a name to trust.

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The AFC coarse bubble disc diffuser design includes top-quality materials and engineering to improve wastewater treatment. Municipal and industrial systems around the world use these diffusers because of their superior efficiency. SSI focuses on reliability and performance during every step of manufacturing to enhance the client’s experience.

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wide band


Wide Band diffusers from SSI Aeration deliver exceptional strength and durability in wastewater treatment applications. For engineers and service providers who need a system that’s more flexible than a fine bubble diffuser and more powerful than another type of coarse bubble diffuser, the Wide Band system is the ideal solution.

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SSI’s coarse bubble diffuser systems offer high technology and reliable oxygen transfer moderation. Here are a few benefits that make these systems ideal for heavy-duty industrial settings:


High Alpha Factor

Coarse bubble diffusers are less susceptible to bacteria build-up, which allows them to deliver a higher alpha factor than other types of diffusers. The presence of surfactants and chemicals in the water, along with the efficiency of the device, can have a major impact on the alpha factor during wastewater treatment.

mbbr wastewater plant


Large diffuser systems have a durable design along with sizeable hole openings to prevent plugging. These coarse bubble diffuser specifications decrease downtime and make wastewater treatment operations more efficient. SSI systems provide fast, effective air distribution and energy-efficiency.

head loss

Head Loss

When it comes to supporting a system that manages airflow and oxygen transfer, minimizing head loss is essential. Coarse bubble diffusers offer a smooth, even performance while maintaining the optimal level of pressure.

oxygen transfer efficiency

Oxygen Transfer

Transferring oxygen to the water column with our coarse bubble diffuser systems is a simple process. While these diffusers require more air than their fine bubble counterparts, SSI reinforced pipes and smart technology make room for efficient oxygen transfer operations.

aeration efficiency

Strong Mixing

If there’s one area where coarse bubble diffusers excel the most, it’s mixing. This is because the larger bubbles produced can move more fluid. Their incredible strength and power make them best suited for mixing substances and decomposing waste.

upgrade options

Low Maintenance

Because of the coarse diffuser’s resistance to clogging, it requires less frequent cleaning than other devices. SSI systems offer additional convenience due to their automated monitoring technology, which allows users to identify issues immediately.

wastewater treatment plant


Course bubble diffusers are exceptionally durable because they’re unlikely to grow bacteria and other contaminants. Operators who choose these diffusers can rely on better functional longevity and fewer repairs and replacements.


With the help of the right coarse bubble diffuser manufacturer, it’s possible to find a durable solution that will fit almost any wastewater treatment application. SSI’s technologically advanced system has the features and simple maintenance requirements needed for a cost-effective, long-lasting product.

To learn more about the worldwide choice of ReliaBall™ disc diffusers, fill out the form below, and one of our experts will contact you.

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