The design of MBBR Biofilter media elements is only one part of the story in an MBBR filter, or any biofilter for that matter.

Other factors such as dwell time, hydraulic loading rate, air and water distribution, media velocity and oxygen transfer all determine overall effectiveness and removal rate of nitrogeous waste.

There is a lot more involved in designing any biofilter than just throwing in media and aerating it, and this especially true of an MBBR

Pure Aquatics have identified specific removal rates for our media the PA-X1, PA-X5 and HEL-X FLAKE, and have optimised its performance through identifying design parameters in biofilter design.

Although surface area plays a role in removal rates in MBBR’s, it isn’t all that is involved.

Please do not hesitate to contact us with your MBBR or other biofilter requirements.

PAX MBBR Biofilter media elements NOW EVEN HIGHER SURFACE AREA!!!!


Total Surface Area >1000m2/m3

Protected surface area approximately 700m2/m3

1m3 of media can nitrify up to 700gm’s of TAN per day @ 1.0mg/L TAN MBBR outlet residual.

Size 11mm x 7mm

Through many years of biofilter design an optimisation, Pure Aquatics have identified shortfalls in some MBBR carrier element designs.

Although surface area does play a part, having a high surface area (when considering conventional MBBR carrier element design) it doesn’t necessarily mean it will process more TAN.

Waste buildup and biofilm thickness, especially in a filter solely designed for nitrification is of the greatest importance, and so a balance between surface area, void space, oxygen transfer and water flow across the media surfaces all determine the medias efficiency.

The PAX1 media has a large surface area with a good balance of protected surfaces for maximum biofilm development, whilst still allowing exfoliation of older biofilms by both physical contact with other carriers, and water flushing of the internals of the media.

Together with our MBBR design and construction parameters, Pure Aquatics can optimise MBBR operation for maximum TAN removal and longevity in performance.

To boost your MBBR’s performance, why not also consider the addition of HEL-X FLAKE?


Surface Area >1600m2/m3

size 24mmD x 5mmPAX5 MBBR media offers a much better surface area compared to medias of a similar diameter. 

Due to the much smaller opening size, reactor design, pre filtration, aeration and mixing must be optimised to ensure thin biofilms on the media are maintained. Pure Aquatics can assist you with the best equipment and design for the task.

This media is best suited to applications where the reactor has larger opening sizes in the outlet screen/strainer but the water is cleaner.

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