Leopold, a Xylem brand
With over 88 years of experience, Leopold, a Xylem brand, is an industry leader in supplying water and wastewater treatment systems to over 8,000 cities and towns around the world including installations on six of the seven continents. Look to Leopold for all your filtration, clarification and sludge collection needs.


227 S. Division Street
Zelienople, PA 16063-1313
United States
Phone: 724.452.6300
Fax: 724.452.1377

Products + Services

The FilterWorx system is designed and engineered to achieve process performance requirements for water and wastewater filtration. These systems are customized to accomplish maximum filtration efficiency at the longest possible filtration cycles. They offer optimum suspended solids removal; filter run times, filter life and filtrate quality are optimized at low costs due to continuous monitoring;... more
  • The FilterWorx system is designed and engineered to achieve process performance requirements for water and wastewater filtration. These systems are customized to accomplish maximum filtration efficiency at the longest possible filtration cycles. They offer optimum suspended solids removal; filter run times, filter life and filtrate quality are optimized at low costs due to continuous monitoring;... more
  • Oxelia oxidation-enhanced biologically active filtration provides a multi-barrier defense—oxidation plus filtration—which destroys recalcitrant organic micropollutants, disinfects, removes pathogens, eliminates oxidation and disinfection byproducts and produces water with high biostability. It can be configured for the customer’s water matrix and energy and regulatory requirements for a cost-... more
  • Leopold Oxelia is an ozone-enhanced biologically active filtration system and multi-barrier solution for municipal wastewater treatment. The system combines ozone, filtration and analytical instrumentation to deliver wastewater treatment for discharge into sensitive waters. This multi-barrier removal opens up increased options for water reuse, including industrial use, groundwater recharge,... more
  • Leopold’s Ultrascreen disk filter brings stainless steel strength and durability to tertiary treatment and reuse applications. The patented “Dynamic Tangential Filtration” combined with stainless steel mesh construction delivers exceptional performance at higher loading rates with unprecedented durability and provides ease of operation at the lowest life-cycle costs. more
  • The Leopold Clari-DAF PW (Potable Water) system is a clarification technology for the pretreatment of rapid gravity filter feedwater. It is a proven, highly effective way to remove low-density particulates, as well as giardia and cryptosporidium. more
  • As part of the complete Leopold underdrain system, the I.M.S. 200 and I.M.S. 1000 media retainers increase flexibility in media design by eliminating up to 14 in. (35 cm) of support gravel. Their physically rigid construction reduces flexing of the slots and the chance of clogging or biofouling. more
  • The Leopold elimi-NITE 2.0 denitrification system harnesses the advantages of deep-bed mono-media filters to effectively and efficiently remove nitrate-nitrogen in wastewater effluent as well as suspended solids, including precipitated phosphorus. more
  • Leopold desalination pretreatment systems can significantly reduce membrane-fouling contaminants—color, organics, soluble metals, oil and algae—before they reach your reverse osmosis (RO) membranes. more


MiPRO Advanced Oxidation Process Pilot Containers
A Simple and Cost-Effective Solution for Sustainable Reuse
Introducing the IMS 200 and IMS 1000 Media Retainers

Increasing Backwash Efficiency

The North Columbus (Ga.) Resource Facility recently completed a $12-million replacement of its settled water filtration by removing the existing Wheeler filters and... more

Colorado Clarification

Johnstown, Colo., is a rapidly growing community located between Denver and Fort Collins. With the town’s water treatment plant operating its circular clarifier systems... more

Attacking Algae

The city of Florence, Colo., Water Treatment Plant (WTP), located 75 miles south of Denver, uses blended surface water taken from the city’s southernmost water reservoir... more

Acquiring the Taste

The Evitts Creek Water Treatment Plant—owned and operated by the city of Cumberland, Md.—is located just over the state border in Bedford, Pa. It provides potable water... more

Freshening Up

Fresh Pond is a vital part of the drinking water supply system for the residents of the City of Cambridge, Mass. Fed by the 2.5-billion-gal Hobbs Brook Reservoir and the... more

Optimizing Dual Media Filtration for Particulate Removal

The Philadelphia Suburban Water Company replaced the support gravel and media in four of the dual media filters at the Pickering West Water Treatment Plant in... more

Vietnam Treatment Plant Upgrade to Include Xylem Ozone Treatment Application

Xylem has been awarded a $1.3 million contract to provide advanced treatment technology to the Saigon Water Corporation’s Tan Hiep Water Treatment Plant 2 in... more

Xylem Introduces Biologically Active Filtration System

 Xylem Inc. has unveiled a new drinking water treatment solution that removes challenging contaminants, including contaminants of emerging concern (CECs), at ACE 15... more

Xylem Opens Office in Vietnam

Xylem Inc., a global water technology company, announced that it has opened a new office in Hanoi, Vietnam, to promote and market its technologies and solutions and... more


The city of Buffalo, Wyo., is among the many smaller U.S. water systems for which reliance on surface water means treatment changes are needed to comply with the Stage 2... more

World Class Water

Superlatives flow easily when describing the new $300-million water treatment plant (WTP) for the city of Winnipeg, Manitoba, Canada. The world-class facility entered... more

Quenching Thirst in the Valley

In what has become a growing trend, the new Point of the Mountain Water Treatment Plant (POMWTP) in Draper, Utah, incorporated a multi-barrier approach to address... more

A Plant for All Seasons

Few would dispute that adequate water supply always has been the lifeblood of any community. Entering the last decade, the existing Freedom District Water Treatment... more

Turning to Filtration

Management at the 7 million gal per day (mgd) wastewater treatment plant and water reclamation facility in Smithfield,N.C., credits a deep-bed biofiltration system as... more

Product Categories

Desalination; Desalination Equipment; Desalination Systems; Filter Media; Filter Underdrain; Denitrification Equipment; Dissolved-Air Flotation Equipment; Filters, Sand & Gravel; Water/Wastewater Filters; Secondary Treatment; Taste & Odor Removal; Treatment Plants; Wastewater Treatment; Wastewater Treatment Equipment, Advanced; Wastewater Treatment Systems, Packaged; Water Treatment; Water Treatment Systems

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Are you planning to upgrade your current water/wastewater facilities in the next year?
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New regulations can result in trepidation or even outright hostility from the companies and... more
For years, we in the water and wastewater industry have been beating the drum regarding our nation’... more
The headlines may be awash in stories of water-related problems and crises, but resourceful... more
Determining an economical & effective approach to fulfilling the UN’s Sustainable Development Goals
In my December column, I discussed the United Nations (UN) Sustainable Development Goals (SDGs) that will shape the... more
Money alone will not solve our nation’s water problems
As is true for many, I have been following closely the tragic public health crisis that has unfolded in Flint, Mich.,... more
Commercials about water treatment during top-rated TV programs are rare treat
Over the past few months I have been noticing an interesting series of commercials on some of the TV channels that I... more
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