JWI filter press industrial wastewater sludge dewatering
Complete Guide to the JWI Filter Press
JWI filter presses are some of the most widely used industrial filter presses ever built. Many systems are still operating today in plating plants, mining facilities, chemical processing operations, wastewater treatment plants, and industrial manufacturing facilities throughout North America and South America. At Met-Chem, we supply replacement parts, troubleshooting support, rebuild services, and replacement equipment for JWI, J-Press, Siemens, Evoqua, and US Filter filter presses.
JWI Filter Press Cloths
Gasketed vs Non-Gasketed JWI Filter Press Plates
Gasketed vs Non-Gasketed JWI Filter Press Plates
Filter cloths are one of the most common replacement items on a JWI filter press.
Over time, cloths can:
- Blind off
- Tear
- Stretch
- Plug with solids
- Lose permeability
Common signs you need new cloths:
- Cloudy filtrate
- Slow cycle times
- Wet filter cake
- Solids bypassing cloth
- Uneven cake formation
Met-Chem supplies replacement cloths for:
- JWI filter presses
- Siemens J Press
- Evoqua presses
- US Filter presses
- Perrin presses
- Hoesch presses
Visit our JWI Filter Cloths page for more information.
Gasketed vs Non-Gasketed JWI Filter Press Plates
Gasketed vs Non-Gasketed JWI Filter Press Plates
Gasketed vs Non-Gasketed JWI Filter Press Plates
JWI filter presses were manufactured using both:
- Gasketed recessed plates
- Non-gasketed plates
Gasketed plates help prevent leaks between plates and are commonly found on:
- High pressure systems
- Chemical applications
- Industrial wastewater systems
Non-gasketed cloths typically wrap over the plate and are zip tied together.
Over time, gasketing can:
- Harden
- Shrink
- Crack
- Fall out of the groove
Met-Chem stocks:
- EPDM gasketing
- Viton gasketing
- O-ring cord
- Type 10 gasket material
- Multiple gasket sizes
Learn more on our Filter Press Gasketing page.
JWI Hydraulic Systems
Gasketed vs Non-Gasketed JWI Filter Press Plates
Why Is My JWI Filter Press Leaking?
The hydraulic system closes the filter press and maintains sealing pressure during filtration.
Common hydraulic problems include:
- Hydraulic leaks
- Low closing pressure
- Cylinder seal failure
- Pump failure
- Pressure loss overnight
Many older JWI presses still operate with original hydraulic systems that may require rebuilding or replacement.
Met-Chem supplies:
- Hydraulic cylinders
- Hydraulic pumps
- Seal kits
- Hydraulic oil
- Complete replacement hydraulic systems
See our JWI Hydraulic Systems page for additional details.
Why Is My JWI Filter Press Leaking?
Industries That Commonly Use JWI Filter Presses
Why Is My JWI Filter Press Leaking?
Leaks are one of the most common filter press problems.
Common causes include:
- Worn cloths
- Damaged gasketing
- Cracked center feed pipes
- Improper closing pressure
- Misaligned plates
- Plate damage
- High feed pressure during startup
A hairline crack in the center feed pipe can sometimes cause liquid to leak:
- Between the head plate and frame
- Around the lock nut
- Outside the manifold piping
Water will follow the easiest path out of the system.
If this occurs, the center feed pipe should be replaced immediately.
Read our Why Is My Filter Press Leaking? article for troubleshooting assistance.
JWI Filter Press Rebuilds & Replacement Parts
Industries That Commonly Use JWI Filter Presses
Industries That Commonly Use JWI Filter Presses
Many facilities prefer rebuilding older JWI filter presses instead of purchasing entirely new equipment.
Common rebuild services include:
- Plate replacement
- Cloth replacement
- Gasketing replacement
- Hydraulic rebuilding
- Electrical upgrades
- Manifold replacement
- Sandblasting and repainting
Met-Chem also supplies:
- New filter presses
- Used filter presses
- Replacement plates
- Replacement cloths
- Air blowdown manifolds
- Feed manifolds
- Corner piping
Industries That Commonly Use JWI Filter Presses
Industries That Commonly Use JWI Filter Presses
Industries That Commonly Use JWI Filter Presses
JWI filter presses are commonly used in:
- Metal finishing
- Plating wastewater treatment
- Mining
- Chemical processing
- Food processing
- Brewery filtration
- Battery recycling
- Municipal wastewater treatment
- Industrial sludge dewatering
These presses are known for producing dry filter cake and capturing fine solids efficiently.
