Filterworx Performance Filter

Alternative content

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, demand requirements, and determine the best pretreatment options.
  • Determine optimal loading rates and best design configuration to meet site conditions and operational requirements.
  • 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.
  • Design the backwash process to restore original headloss and solids storage capacity, maximize filter runs while minimizing power costs and wastewater generation.

Backwash and System Controls

The Keys to Efficient Operation, Longest Filtration Run Cycles, and Lower Operating Costs: FilterWorx control system continuously monitors filtrate quality and filter bed conditions. Your filter is backwashed only when needed and only for as long as needed. Filtrate quality and filter run volumes are optimized, while reducing energy consumption and wastewater generation. Our controls keep the filter media well conditioned, extending the life of your filter.

Efficient Deep Cleaning Backwash: Genuine Leopold® Underdrains and I.M.S® media support evenly distribute backwash water and air to every portion of the filter bed, eliminating dead zones. Air scour increases shear and develops collapse pulse throughout the bed, for a deep clean with reduced backwash water consumption.

Complete Integration: We use standard communication protocols that easily integrate into most other plant control or SCADA systems.

Leopold® engineers can assist you in developing a cost effective, energy efficient, high performance system designed to meet your requirements.


Leopold® Underdrains

Three types of underdrains to meet any configuration need Underdrains collect filtered water during the filter run, and distribute air and water during backwash cycle. All Leopold® underdrains deliver the superior performance that has made the Leopold Underdrain the industry leader.

  • Superior Air and Water Distribution for effective backwash. The dual parallel lateral design and the water recovery channels, both developed by Leopold®, give even distribution with less than 5% maldistribution and no dead zones, even in extra-long length laterals.
  • Cleaner filters mean longer filter runs and higher water efficiency, more product water, less waste. This lowers your operating costs per gallon or liter of filtered water.
  • Air Flow Adjustability allows YOU more control and saves energy and water. Air scour rate can be adjusted from 1 to 5 SCFM/SQ.FT. (0.3 to 1.5 m/min), enabling collapse pulse cleaning during concurrent air/water backwash with various media configurations. Air scour provides higher shear forces and cleaner media, with less wastewater generation.
  • Faster installation with fewer parts than nozzle systems and no false floor. Underdrain blocks are light weight for easily handling and snap together for quick installation, shortening construction time and putting you in production quicker.
  • Design Flexibility with different heights to allow for different combinations of lateral lengths and vertical filter heights, as well as different flume configurations.

Underdrain Type

inch (cm)

Lateral Length Feet (Meters)

Center Flume

Front Flume

Wall Sleeve

Leopold® Flat Bottom

Type S®

12 (30)

96 (29.3)

48 (14.6)

48 (14.6)

48 (14.6)

Type SL®

8 (20)

32 (9.75)

16 (4.9)


16 (4.9)

Type XA™

8.25 (21)

64 (19.5)

32 (9.75)

32 (9.75)

32 (9.75)

Return to Top

Leopold® I.M.S® 200 and I.M.S® 1000 Media Retainers

Engineered to eliminate everything you worry about

  • Replaces up to 14 inches (35.6 cm) of Gravel Media Support allowing for the same media depth in less vertical space, reducing construction costs.
  • Compatible with all Leopold® Underdrains, I.M.S® retainers installwith simple tools, saving time and labor, again reducing construction time and costs.
  • Provides even backwash distribution to deep clean filters.
  • Two Sizes for different applications
    • I.M.S.® 200 with 0.2 mm overlapping slots is specifically designed for drinking water treatment using dual media or mono media anthracite. Supports media of effective sizes down to 0.45 mm sand
    • I.M.S.®1000 with 1 mm tapered slots is specifically designed for wastewater treatment applications, including the elimi-NITE denitrification system developed by Leopold. Supports media of effective size down to 1.7 mm.

Return to Top

Leopold® Engineered Filter Media®

Whether monomedia deep bed, dual media, tri-media, we carefully evaluate your influent water characteristics and process requirements. Then we provide the right configuration of media, with the effective size and uniformity coefficient to give energy efficient, consistent and long term performance.
In the US, we can provide anthracite engineered media with the lowest uniformity coefficient in the industry. A lower uniformity coefficient provides:

  • Superior filtration qualities,
  • Increased filter run volumes, and
  • Requires less water to thoroughly backwash.
  • Less frequent and more efficient backwash saves energy and increases overall water production.

Return to Top

Leopold® Backwash Water Troughs

Our troughs help conserve media while removing backwash water efficiently. Made of durable fiberglass reinforced plastic (FRP), backwash water troughs are sized and configured to match your process needs.

Return to Top

Leopold® Trough Guards® Media Baffles

Leopold® Trough-Guard® media baffles are a stainless steel assembly that is fastened onto both sides of washwater troughs to help ensure that no significant media loss occurs during sustained concurrent air/water backwash at recommended rates. The media baffles create a quiet, air-bubble-free zone where media settles out and returns to the filter bed. Applied in conjunction with the Leopold® FilterWorx® automatic filter control system, Trough-Guard® media baffles not only reduce media loss, but also provide optimum cleaning of the media.

Return to Top

Leopold® FilterWorx® Automatic Filter Control System

Leopold® filters include a complete filter control package to keep a constant watch on the essential parameters of the processes in the filter plant - both upstream and downstream. These automatic control systems continuously monitor filtrate quality to ensure that it meets regulatory requirements. They continuously monitor the condition of the filter media to ensure optimum filtration. And they automatically adjust flow rates to compensate for customer demand changes.

By continuously monitoring water quality and filter condition, Leopold® filter controls can automatically initiate and control the backwash sequence. This means the filter is cleaned when it needs to be cleaned, as frequently or infrequently as changing conditions require, and as long as necessary to clean the media. Filter run times and product quality are optimized at the lowest possible cost. And by keeping the filter media well-conditioned, the life of the filter can be lengthened.

By automatically sequencing backwash properly, Leopold® filter controls help avoid surges and potentially disastrous upsets which can damage a filter system and cost money.

Return to Top

Leopold® Flat-Bottom Flume® configuration

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

Return to Top