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The History of the JWI Filter Press
From JWI to US Filter, Siemens, Evoqua, and Xylem
If you own a JWI filter press, you may have noticed that the equipment has been sold under several different company names over the years. Depending on the age of your machine, it may carry a JWI, US Filter, Siemens, Evoqua, or Xylem nameplate.
Although the ownership changed several times, thousands of these filter presses remain in operation today in industrial wastewater treatment plants, plating facilities, chemical plants, mining operations, food processing facilities, and municipal sludge dewatering applications.
At JWI Filter Press Parts, we continue to support these machines with replacement cloths, plates, center feed pipe assemblies, gasketing, hydraulic components, cylinders, and technical support.
Who Was JWI?
JWI, originally known as JWI Inc., became one of the most recognized manufacturers of filter presses in North America.
Their equipment was known for:
- Heavy-duty construction
- Recessed chamber filter presses
- Automatic plate shifters
- Reliable hydraulic closure systems
- Long equipment life
Many JWI filter presses installed in the 1980s and 1990s remain in operation today.
Common industries included:
- Metal finishing
- Electroplating
- Mining
- Chemical processing
- Food processing
- Municipal wastewater treatment
JWI Becomes US Filter
As the wastewater treatment industry consolidated, JWI became part of US Filter.
Many filter presses manufactured during this period were mechanically identical to earlier JWI machines.
Customers often encounter equipment carrying either:
nameplates while ordering replacement parts.
Fortunately, the majority of replacement components remain interchangeable.
Siemens Acquires US Filter
US Filter was eventually acquired by Siemens.
During this period, many filter presses were marketed as Siemens J-Press filter presses.
The J-Press name became extremely popular and remains one of the most recognized filter press brands in North America.
Many customers today refer to their equipment simply as a:
even though the machines are nearly identical.
Evoqua Takes Over
The water treatment business was later separated and became Evoqua Water Technologies.
The Evoqua J-Press continued the long history of the original JWI filter press design.
Replacement parts often remained compatible between:
machines.
This is why many facilities continue to purchase replacement parts for equipment that may be 20 to 40 years old.
Xylem Acquires Evoqua
Most recently, Evoqua became part of Xylem.
Today, many operators searching for JWI filter press parts are actually operating equipment manufactured under one of the following names:
While the company ownership changed, the installed equipment base remains enormous.
