Auto-Shell™ Walnut Shell Filters

Auto-Shell walnut shell filters remove oily contaminants from water, and are used in treating oilfield produced water, refinery wastewater, steel mill direct spray and caster water, ethylene plant quench water, copper concentrate decant and cooling water.

Patented Auto-Shell filters use a deep bed of 100-percent black walnut shells that have excellent surface characteristics for coalescing and filtration, as well as superior resilience to attrition. They offer a 66-inch nutshell bed – the deepest in the industry. These filters eliminate the need for flat media retention screens, and use only one media-scrubbing pump for up to eight filters. This simplifies the design and lowers the cost of multiple filter systems.

Features and benefits of the system include flat media retention screens that are not required; only one media scrubbing pump is needed, simplifying the design and lowering the cost; a deep nutshell bed that produces superior effluent quality, longer filtration runs and greater throughput efficiency; a backwashing process that uses the raw process water, eliminating the need for air scour, stand-by filters or additional storage tanks; twice the flux rate of conventional filters in the same application; and filtration that removes three times the amount of solids before cleaning is required.

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