Leopold® Brand

An Industry Leader with Innovative Technologies Since 1924

Xylem Water Solutions Leopold, Inc. has long been a global leader in the water and wastewater industry. Since its establishment in 1924, Leopold has pioneered and acquired a number of innovative technologies aimed at improving the quality of water, from the initial dual parallel lateral underdrain to the newly advanced Leopold® Type S® Universal® underdrain, and from the Leopold® CT2® submerged sludge collector to the Leopold® Clari-DAF® dissolved air flotation systems.

From the beginning, Leopold has been synonymous with rapid gravity media filtration. Over the past 80 years, we've proven our expertise and leadership in filtration technology and offer a wide range of systems and equipment that employ the many innovations we have pioneered. During the 1920s and 1930s, Leopold responded to an increased demand for safe drinking water with the development of various filter underdrains. In the early 1940s, continuing its exploration of filtration principles, Leopold obtained a patent for our first filter bottom featuring the revolutionary dual parallel lateral design. Clay tile was first offered in 1945 and improved twice over the years. Leopold has over 3,000 installations of clay tile.

More recently, Leopold has developed three underdrains of plastic construction. First came the Universal® underdrain, introduced in 1977. Leopold has over 400 installations of the Universal® underdrain—over 20 years of experience applying the plastic underdrain to air scour operations. After the Universal® underdrain, Leopold developed the Superblock II™ underdrain, a plastic version of the clay tile underdrain used for hydraulic only backwash. Leopold has over 200 installations of Superblock II™ underdrain.

Leopold's most recent filter innovation, the Type S® technology, has resulted in two state-of-the-art underdrains, the Type S® Universal® underdrain and the Type SL® Universal® underdrain. Type S® technology is the next generation air/water underdrain that provides unparalleled distribution of air and water to that of any other underdrain product in the industry. Since its inception, Leopold has over 1,000 installations of Type S® technology and over 1.6 million square feet in operation in water and wastewater treatment.

During this time, Leopold enhanced its filter system with the introduction of IMS® cap in 1990. IMS® cap was developed to eliminate support gravel from granular media filters. IMS® cap is a porous plate product constructed of HDPE (high-density polyethylene) beads sintered together. The IMS® cap is factory installed on the underdrain. Leopold has over 1,000 installations of IMS® cap on Leopold underdrains totaling well over 2 million square feet.

Completing the Circle of Filtration

The design of a complete filter system requires more than just underdrain. Leopold provides all of the components required for a complete operating filter system. Leopold designs and manufactures the air header pipe system for air/water backwash filters. Leopold also manufactures fiberglass-reinforced plastic (FRP) backwash water troughs with or without Leopold® TroughGuard® media retaining baffles. Over the years, Leopold has acquired other technologies to provide a complete operating system such as straight-line and S-type surface agitators.

Filter media selection is critical for optimal performance of a granular media filter. Recognizing this, Leopold acquired its own state-of-the-art anthracite processing facility in 1990. This state-of-the-art facility can produce low uniformity coefficients, less than 1.3 UC.

During the decade of the 1980s, Leopold continued to expand and strengthen its role as a leading supplier of state-of-the-art technologies to the water and wastewater treatment industries with the introduction of PLC (programmable logic control) based filter consoles. In the late 1990s, Leopold introduced FilterWorx® automatic control system (ACS) which is a complete filter control package consisting of all instrumentation and control equipment for the automatic monitoring and control of municipal water filtration systems. FilterWorx® ACS delivers the efficiencies and economies necessary for today's systems and the 80 years of filter process and control knowledge you can only get from Leopold.

In today's market, where filter projects range from the construction of new filters to the refurbishment of existing, older filters, costs remain the key issue. In response to this, Leopold has invented a novel filter design for new filters—the Flat Bottom Flume® filter—that provides a filter system with the lowest installed cost available. In retrofit situations, Leopold evaluates the existing filter design and determines the most cost effective method for introducing air into older, water-only backwash filters. Regardless of the type of project, you can be sure that, with over 8,000 installations worldwide, we have seen all types of filter designs. This experience, coupled with our design and manufacturing expertise, ensures that you will receive a superior filter system.

Increasing Emphasis on Clarification Technologies

Leopold's experience runs deep in the design, engineering, and manufacture of clarification systems and equipment such as our Clari-Vac® floating sludge collector and our CT2® submerged sludge collector. In the late 1970s, Leopold acquired vacuum sludge collection technology, the foundation for its Clari-Vac® product line. In the 1980s, in response to a need for more versatile sludge removal, Leopold developed the Clari-Trac® submerged sludge collector, which was later improved in the 1990s and renamed CT2® submerged sludge collector. Leopold has over 200 installations employing its sludge collection equipment in various applications for both water and wastewater treatment.

In the 1990s, Leopold introduced its Dissolved Air Flotation (DAF) system to the United States. DAF is a process whereby very fine microbubbles attach themselves to particles in the water and float them to the surface where they form a floating sludge blanket that is easily removed using either mechanical or hydraulic means. In the United States, one of the largest DAF plant for potable water treatment, 75 MGD (285,000 m3/day), is a Leopold Clari-DAF® system installed in Greenville, South Carolina. Leopold has tested numerous applications for optimization of DAF algae removal, taste and odor removal, color reduction, backwash water treatment, and lagoon treatment, to name a few. Recently Leopold introduced the Clari-DAF® system that not only covers the uses listed above, but also dissolved air flotation for membrane pretreatment and high-rate Clari-DAF treatment.

Support and Service Makes the Difference

When you specify and purchase Leopold, you are getting more than just a product. Our full spectrum of engineering services ensures that our products and systems work with the unique requirements of your application. A full range of field services, factory parts, and contract maintenance is also available. In addition, we bring to you the full depth and support of our Product Development Center, our research and development facility dedicated to testing of new products or new applications for existing products. Using Computational Fluid Dynamics (CFD), Leopold can model a customer's application and further verify the design in our hydraulics laboratory.

In addition to our R&D efforts, Leopold employs a variety of pilot facilities: our Clari-DAF pilot trailers, numerous pilot filter columns, and portable Clari-DAF jar test units. With a wide range of process applications, our pilot plants can verify the best treatment scheme for your application. In our Product Development Center, we have a wet lab where we conduct a variety of water treatment analyses when using a Leopold pilot facility.

In essence, Leopold is a full service supplier, able to take an active partnership in solving your water treatment problems.

For More Information

  • Telephone: + 1 724-452-6300
  • Fax: + 1 724-452-1377
  • E-mail: sales@FBLeopold.com
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