Walnut Shell Media Filters

The Filtra-Systems Walnut Shell Media Filter is designed to remove oil and suspended solids with superior efficiency.

Here’s how:

• Contaminant Removal: As water passes through the media bed, oil and solids are retained efficiently. Walnut shell media behaves like a magnet, removing 95% to 99% of suspended solids and 90% to 99% of hydrocarbons, leaving water exceptionally clean.
• Backwashing Technology: When the walnut shell bed becomes full of contaminants, a powerful patented backwashing system automatically cleans the media bed.
• Rotating Media Scrubbing Assembly: This patented technology fluidizes and scrubs the media bed, achieving complete regeneration of the media during each backwash cycle.

The best part? This entire process requires:

• No chemicals
• No surfactants
• No air sparging cycles

This backwashing approach makes the walnut shell filter not only the most efficient solution but also the easiest to maintain.

The walnut shell media filter offers distinct benefits over conventional filtration systems like sand and anthracite filters.

Designed with durability and efficiency in mind, it solves common filtration frustrations while improving operations.

Better Filtration Results

• Removes 95% of solids at 5 microns and 90%-99% of insoluble hydrocarbons.
• Captured oil remains in droplets (unlike sand filters, where oils form clogs), enhancing filtration over time.
• The oil absorption capacity of walnut shells is 2-3 times greater than sand media, ensuring optimal performance over a long period without clogging.

Cost-Effective and Long-Lasting

• Walnut shell media doesn't need replacement thanks to its high durability, as black walnut shells have an exceptionally low attrition rate of only 2% per year.
• Unlike sand filters, which require frequent replacement or cumbersome manual cleaning, walnut shell media is sustainable and designed to last the filter’s entire lifetime.

Space-Saving Design

• Walnut shell filters operate at flux rates of 10-12 gpm/ft², which is significantly higher than sand filters (6 gpm/ft²) and anthracite filters (4-4.5 gpm/ft²).
• This results in smaller filter housings, freeing up valuable floor space for other equipment in your facility.

Click here to discover the advantages of a walnut shell media filter

Many facilities struggle with traditional filters—especially in oily water applications.

Common issues include:

• Mudball formation from oil exposure

• Frequent media replacement every 6–60 months

• Excessive water usage during backwash cycles

STiR Backwash vs. Traditional Filters:

These walnut shell media filters eliminate these pain points with lower water usage, no chemical additives, and reliable automatic backwashing.

With over 40 years of experience, Filtra-Systems has solidified its position as the industry leader in walnut shell filter systems. By designing, building , and field-testing solutions for a wide range of applications, we’ve delivered reliable and cost-effective systems to meet customer needs.

Our patented STiR Deep Bed Nut Shell Media Filter technology is based on the kinetic model of a Continuous Stirred-Tank Reactor (CSTR) —the only scientifically proven regeneration technology available today. This design ensures maximum backwashing efficiency, and hundreds of installations worldwide confirm its success.

Not ready for a capital investment? Filtra-Systems offers rental systems that fit into your budget, giving you access to state-of-the-art filtration technology without upfront equipment costs.

When your sand, anthracite, or multimedia industrial water filter system stops backwashing properly, the Walnut Shell Filter will do the job, 100% guaranteed.