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Mike Jager
Product Manager

Large Capacity J-Press® Sidebar Filter Presses

The Large Capacity J-Press® Sidebar Filter Press is a high-performance solution for higher capacity dewatering operations

The Large Capacity J-Press® Sidebar Filter Press is a high-performance solution for higher capacity dewatering operations. It offers the most advanced automation available, from fully automatic plate shifting and cloth washing to Evoqua’s unique MOCS filter press control system and a full complement of ancillary slurry processing and cake handling systems. The Large Capacity J-Press® Sidebar Filter Press combines rugged ASTM-A36 steel construction, precision engineering, ease of operation and a wide range of features and options to tackle the most difficult dewatering problems.


 J-PRESS® Large Sidebar FILTER PRESS — Big on Performance

J-Press Larger Sidebar Filter Presses feature a heavy-duty carbon steel frame engineered to provide maximum rigidity for clamping forces exceeding 800,000 lbs. The J-Press side bar is available with 100 psi (7bar), 225 (6 bar) or higher pressure configurations, with plate size and respective hydraulic capacities ranging from 1m to 2m x 2m. The Large Capacity J-Press® Sidebar Filter Press robust features are engineered for long-term dewatering performance under the most demanding industrial municipal applications; a full complement of feed pumps, plate shifters, manifolds, and controls ensures efficient operation with minimal operator requirements. In addition, options for pretreatment, automatic cake release, cloth washing, material handling and safety features can be incorporated into a J-Press dewatering solution.


 features and benefits

Features and Benefits

  • Available in 4 frame sizes from 1200mm to 2000mm made of heavy duty carbon steel plate and sheet, sandblasted and finished for maximum service life.
  • In order to optimize application performance the J-Press is available in 2 standard operating pressures of 100 psig (7 bar) and 225 psig (16 bar)and cake holding capacities from 50 (1.42 m3) to 600 ft3 (16.99 m3) –Self compensating electric/hydraulic closure system is standard to minimize labor requirements
  • All process connections come pre-piped for plug-and-play installation (dependent on size, options selected and shipping restrictions).
  • All filter plate wetted parts are polypropylene with PVC, carbon steel or stainless steel piping manifold for maximum corrosion resistance.


 System Design and Engineering


Filter Press Engineering to Suit Your Needs

Our technical sales and engineering staff is available to develop the best solution for your application based on innovative analysis technologies, customized system engineering and a sound knowledge of customer applications and requirements. Designs begin with the development of an effective process layout, taking into consideration system performance objectives, operating costs and maintenance requirements. A Process and Instrumentation Diagram (P&ID) is developed to articulate the physical sequence of the equipment layout and provides the basis for the development of system design and equipment selection as well as system control schemes. Evoqua controls engineers use the latest technology and tools to develop a process control package that provides a state of the art operator interface that is both user friendly, safe to use and cost effective. Safety is a primary concern of any Evoqua equipment design and the J-Press® filter press is no exception. Our engineers incorporate all the latest features and interlocks for intrinsically safe operation.

Sidebar Frame Designs

Large Capacity J-Press® Sidebar Filter Press is available with plate sizes ranging from 1.2 m x 1.2 m to 2.0 m x 2.0 m and fully automatic operation. Its heavy duty construction utilizes proven operating functionality for long-term, economical operation.

Sidebar Compression Close

A single hydraulic cylinder keeps the filter pack closed while in the compression stroke. Filter plates are suspended by the plate handles resting on the sidebar.


  • Available in a wider range of sizes, from 470 mm to 2.0 m x 2.0 m designs, with working pressure ratings of 100 psi (7 bar) and 225 psi (16 bar)
  • Lighter weight than overhead designs
  • Plates are easily accessible and removable from top • Full range of automation options
  • Available with air hydraulic systems in smaller sizes • Less expensive than overhead designs


Option in Filter Packs

Large Capacity J-Press® Sidebar Filter Press filter plates are available in recessed plate, diaphragm plate and plate and frame designs in a wide range of materials to fit your specific application.  Capable of producing cake in thicknesses of 3/4" to 2", these filter plates are recessed on both sides, and when placed side by side in a filter place pack, form cavities called chambers. Each chamber wall, known as the drain-field, has a series of raised cylinders or grooves covered with a porous cloth medium. These grooves or "pips" form a flow path for the liquid draining from the press.

At alternating corners of the drain-field, interconnecting holes join the drain-field to the four corner discharge ports. When the plates are held together in a plate pack, the corner discharge eyes form individual manifolds connecting the drain-fields of the plates with the external piping of the press. The center or corner feed slurry inlet port also forms a manifold that connects with the individual cake collection chambers of the plate pack.


Pressure Differential For Uniform Cake

The driving force behind the slurry, which is typically 100 psi, but can range up to 900 psi, is provided by a positive displacement or, less frequently, a high head centrifugal feed pump. With a gravity drain on the filtrate side of the press, a pressure differential between the feed pressure and the gravity discharge is created across the media and the filter cake solids as they build in thickness. It is the existence of this pressure differential, not just the feed pump pressure that causes the filtering action to occur. Solids within the slurry will flow to the area of cake development with the lowest pressure differential, resulting in a filter cake, which builds uniformly over the drain-field on either side of the chamber walls. This process is the basis for cake filtration.

This solids deposition process continues until the filter cakes forming on the individual chamber walls bridge at the center, completely filling the press with solids, until it reaches the setpoint where the feed pump shuts off. Once this is achieved, the hydraulic closure of the press is retracted, the individual filter elements are separated and the collected solids (filter cake) are discharged, usually by gravity, to an appropriate receptacle.

Filter Pack Automation and Plate Shifting

Automation of the Large Capacity J-Press® Sidebar Filter Press is available for process control, cake discharge, cloth maintenance and safety. Our sales engineers develop each filter press design with automation packages using a building block approach so they can assist you in choosing the system that will deliver optimal performance for your particular application.

The baseline plate shifting mechanism for the sidebar filter press is the shuttle style shifter, which promotes positive plate separation for optimal cake discharge. Our overhead filter presses use a high speed continuous plate shifting mechanism for a more rapid cake discharge. This system can incorporate an optional plate latching system to ensure single plate shifts. Both shifter systems can be upgraded to include a "Plate Bump" mechanism for auto assisted cake discharge.

The final tier of filter pack automation (available only in the sidebar configuration) is the Automatic Cake Discharge Detection System (ACDDS), which incorporates a bump system that can literally weigh each filter plate to detect excess filter cake on the plate as it is being shifted.

Continuous Filtration

The filter press may also be used as a continuous or "polishing" filter to remove minute quantities of solids from an influent stream. In these polishing applications, the press is not sized for the quantity of batch or solids holding capacity but for maximum filtration area and hydraulic throughput. When used as a polishing filter, the press is usually precoated, and generally a dry filter cake is not the end product. Rather, when throughput flow rates drop to an unacceptable level up to the build up of solids, the cycle is stopped, the solids are discharged, and the filtration is restarted.


Variable Volume

The J Press can be converted from a fixed volume filter to a variable volume filter through the use of a filter plate known as a diaphragm or membrane plate. This type of plate has a flexible drain-field which when sealed around the edges forms an integral bladder or diaphragm that may be inflated to physically press additional liquid from the filter cake. This process can significantly reduce the typical elapsed time for a press cycle and should produce a dry cake product regardless of the quantity of the solids contained in the filter press at the time of diaphragm inflation.


  • Available with polypropylene recessed plates in gasketed or non-gasketed designs, membrane squeeze plates or plate and frame filter elements in 5 different cake thicknesses. Evoqua engineers match your application goals with the most cost effective solution
  • The J-Press can be equipped with a semi-automatic plate shifter on smaller frames and fully automatic plate shifters on larger frames to improve plate-shifting efficiency.
  • The automatic plate shifter can also be equipped with an optional plate bump system for positive cake discharge capabilities.
  • An automatic high-pressure cloth wash system may be added to help keep your J-Press operating at peak efficiency.
  • With future expandability in mind, the J-Press frame can be supplied with an expansion package that allows for an approximate 50% increase in press capacity with no change to the equipment footprint.
  • Evoqua's line of control optional provides unparalleled flexibility in operating your J-Press. From simple APCS automatic pump control system to our MOCS series of control systems the J-Press and its ancillary equipment functions can be automated to the degree required to meet your operating objectives.


 From feed pumps to cake disposal systems, a variety of process and material handling options are available from Evoqua. Contact us for more information.


Spec Chart and Dimensions

Diagram Notes

Based on 32 mm cake thickness, 100 psi (7 bar)

1200 mm
​Volume (ft3)​50.0​125.0
Volume (L)​​1416.0​3540.0
​Height 74.5" (1892 mm)​Length (in)​217.0​356.0
​Width 60.0 " (1524 mm)​Length (mm)​5512.0​9042.0
1500 mm​Volume (ft3)​130.0​270.0
​Volume (L)​​3682.0​7646.0
Height 95.7" (2432 mm)​​Length (in)​313.0​500.0
​Width 74.9" (1903 mm)​Length (mm)​7950.0​12,700.0
​1.5 x 2.0 M​Volume (ft3)​275.0​350.0
​Volume (L)​​7788.0​9912.0
​Height 136.6" (3470 mm)​Length (in)​430.0​507.0
​Width 79.0" (2007 mm)​Length (mm)​10,922.0​14,097.0
​2.0 x 2.0 M​Volume (ft3)​300.0​600.0
​Volume (L)​​8496.0​16,992.0
​Height 106.0" (2692 mm)​Length (in)​406.0​562.0
​Width 137.0" (3480)​Length (mm)​10,287.0​14,275.0


Dewatering@evoqua.com Large Capacity J-Press® Sidebar Filter Presses