Nature’s billion-year-old natural ecosystem for sulfur-oxidizing bacteria. Crater-Max® is specifically engineered and processed for chemical resistance, size, and optimum surface area for H2S removal.


Details and Specifications

This corrosion-resistant material has been successfully utilized in numerous Bio-Scrubber® (biotrickling filter) applications and as a base layer to significantly extend the life of organic Biofilter media.

Bulk Density (Dry): 51 lbs/ft3

Typical EBRT: 5–15 sec

Differential Pressure: 0.125"/ft media

Face Velocity: 3–6 fpm

Crater-Max installed at San Jacinto biofilter

Media Selection and Design Support

To utilize biological organisms and mitigate wastewater odors, it is necessary to understand two basic biochemical processes—autotrophic and heterotrophic, and their opposing requirements and ecosystems.

Autotrophic bacteria consume inorganic compounds as an energy source and receives carbon from carbon dioxide. Heterotrophic biological organisms must obtain both energy and carbon from the organic food they consume. GES Biotek is pleased to offer site-specific media selection and design support to create the ideal green environment for your application.

Crater-Max® Case Studies

Check out what Crater-Max® media has done for these installations.

Enhanced Cell-Max installed at Eastern Municipal Water District, San Jacinto, CA

Eastern Municipal Water District, San Jacinto, CA

Enhanced Cell-Max™, Crater-Max®

GES Biotek installed a dual-media ecosystem to properly distribute the foul air and remove all complex odors and VOCs.

Crater-Max installed at Headworks Bar Screen Project, Hayward, CA

Headworks Bar Screens Project, Hayward, CA


Biofilter beds were refitted with porous Crater-Max® media, which served as the ecosystem for the microorganism growth.

Bio-Filter irrigation

Bio-Scrubber® Tower System, Livermore, CA


GES Biotek was called in to determine the cause of recent drops in system efficiency and suggest corrective action.

Additional Products



Rigid, acid-resistant media designed for the treatment of high levels of H2S in Bio-Scrubbers®.

Enhanced Cell-Max

Enhanced Cell-Max™

All of the benefits of high-performance engineered biofilter media, but at a quarter of the weight.



A proprietary blend of organic materials for the removal of complex odors and VOCs.

GES Nutrients

GES 1587 Super Nutrients

Enhance the growth of acidithiobacillus thiooxidans and ferroxidans microorganisms in a biological scrubber ecosystem.