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Filterworx performance filter

Overview System Components Specifications Solutions Documentation & Tools


Product Features


  • Potable drinking water treatment
  • Tertiary wastewater treatment
  • Nutrient removal in water or wastewater
  • Reverse osmosis membrane desalination pretreatment
  • Water reuse
  • Biological Active Filtration (BAF) 

Water challenges addressed

  • Aging infrastructure
  • Harmful algal blooms
  • Water scarcity
  • Contaminants of emerging concern (pharmaceuticals, personal care products)
  • Cryptosporidium and giardia
  • Reduction of disinfection byproducts
  • Taste and odor

Leopold engineers have been at the forefront of gravity media filtration since 1924. With more experience than anyone in the industry, we can help you analyze, evaluate and design all aspects of your complete filtration system.

Evaluate influent water qualities, including seasonal changes and demand requirements, and determine the best pretreatment options.

Select the best media characteristics, media quality, bed composition, bed depth and grain size distribution to match the filter configuration, influent quality, pretreatment processes and required filtrate effluent quality.

Determine optimal loading rates and best design configuration to meet site conditions and operational requirements.

Design the backwash process to restore original head loss, maintain solids storage capacity and maximize filter runs while minimizing power costs and wastewater generation.

System Components

System Components

Backwash Water Troughs

Xylem's Leopold fiberglass backwash water troughs are used in water and wastewater filters to provide uniform removal of wash water during backwashing. Molded of densely laminated fiberglass-reinforced plastic, Xylem's troughs are durable, corrosion resistant, reinforced for strength and stiffness, and maintenance free. They are easy and economical to install, with no costly forming work, and all mounting brackets, hardware, and stabilizers are stainless steel.

Engineered Filter Media

Leopold Engineered Filter Media is processed in a unique, state-of-the-art facility specifically designed to produce anthracite filter media with low uniformity coefficients (UC). What truly sets Xylem apart from most of other media processors is moisture reduction prior to screening. Reducing the moisture in the raw feedstock greatly enhances screening efficiencies, enabling more anthracite to be shipped – and less water – and to produce multiple distinct media sizes all with UCs below 1.30.


Our flat-bottom flume reduces excavation requirements and support structures. This simplifies new construction, resulting in substantial cost savings. We can also design FilterWorx systems with front flumes, center flumes or H flumes, or even wall sleeves for conversion of an existing basin. We will carefully evaluate your site requirements to provide the most cost effective flume configuration.

I.M.S 1000 and 200 Media Retainers

Providing a more effective option than using gravel in most applications, the I.M.S 1000 and 200 media retainers are engineered to allow for improved backwashing and improved air and water distribution for cleaner media. Thanks to their physically rigid construction and precision engineered injection molded slots, the I.M.S 1000 and 200 media retainers eliminate dead spaces and provides longer filter runs reducing overall operating costs. The patent pending baffles on the bottom of the plates are designed to ensure air doesn’t roll to the high end of the caps. The I.M.S media retainers replace up to 14 inches (36 cm) of gravel media support allowing for the same media depth in less vertical space and longer air/water backwash.

System Controls

Filterworx system controls continuously monitors filtrate quality and filter bed conditions. The filter is backwashed only when needed and only for as long as needed. Filtrate quality and filter run volumes are optimixed, while reducing energy consumption and wastewater generation. Filterworx controls keep the filter well conditioned, extending the life of the filter. Filterworx system controls use standard communication protocols that easily integrate into most other plant control or SCADA systems.


Underdrains collect filtered water during the filter run, and distribute air and water during the backwash cycle. Providing cleaner filters mean longer filter runs and higher water efficiency, more product water, and less waste. This lowers operating costs per gallon or liter of filtered water. All Leopold underdrains, Type S, Type SL, and Type XA, deliver the superior performance that has made the Leopold underdrain the industry leader.



General Information
Filterworx performance filter
Potable Water, Wastewater, Desalination Pretreatment
Flow rate
1 MGD+ (3,788 m3/day+)
Contaminates removed
Potable Water: Particulate, Turbidity, Organics, Iron, Manganese, TOC; Wastewater: Total Suspended Solids, Ortho-phosphorus, Nitrate, Organics; Desalination Pretreatment: Particulate, Silt, SDI reduction
Process warranties offered
Warranties on effluent quality
Single source responsibility
Yes, to supply all system components
Types of backwash suitable
Water only, sequential air followed by water, concurrent air/water and sustained air/water
Standards met
AWWA, ASTM, British DWI, French
Flume types suitable
Flat Bottom Flume, Front Flume, Center Flume, H-Flume
Construction type
New or existing regardless of current underdrain type
System Components
Filterworx performance filter
Dual parallel lateral underdrain available
Type 360, Type XA , Type S, and Type SL
Media support systems available
Graded gravel, I.M.S 200 media retainer or I.M.S 1000 media retainer
Types of media that can be used
Silica Sand, High density sand, Anthracite, Granular Activated Carbon, Expanded Clay
Trough types
Fiberglass, Stainless Steel
Media retention available
Yes, stainless steel
Control system
Automatic, Manual, Semi-Automatic
Valve actuator
Electric, pneumatic, hydraulic
Flow measuring instruments
Venturi, Mag-meter, transit time
Turbidimeters, Particle Counters, Nitrate, Phosphorus, TOC, DO
Blower types
Positive Displacement, Centrifugal
Pump types
Submersible, end suction, split case, vertical turbine
Documentation & Tools

Documentation & Tools