The plate and frame filter design is the standard in basic process depth filtration for clarification and pre-filtration in industries such as the pharmaceutical, chemical, cosmetic, food & beverage, and electric utility. Plate and frame filter presses provide the lowest cost of filtration per unit of fluid processed. ErtelAlsop offers application specific filter designs, in stainless steel or polypropylene, with unique features for flow rates ranging from large volumes to pilot plant and laboratory scale.

All ErtelAlsop plate and frame filters are manufactured using our superior internally ported design. Internal porting offers a number of benefits over external porting. Internal ports allow for a greater choice of filter media in a broad range of material and thickness, including pads, paper and cloth. In an internally ported filter press the filter media itself works as the gasket, eliminating concerns over gasket-product compatibility. With no need to change gaskets, you save time, money and labor. Plate and frame filters with internal ports are also inherently more sanitary since there can be no cross-contamination of O-rings from batch to batch due to product holdup.

Larger cake accumulation results in longer filtration cycles and even more importantly, the ability to achieve efficient washing of the cake to recover valuable product for further processing. Product recovery via cake washing is one of the major economic benefits of using plate and frame filter presses.

ErtelAlsop plate and frame filter units are designed to accommodate a wide range of components. These include sludge inlet frames for cake accumulation, dividing heads for multiple-step/one-pass filtration, sanitary fittings, special piping and gauges as well as pumps and motors to meet a wide range of applications. For filtration/separation processes where a sealed, vapor-tight environment is desired, our Vapor-Master® Enclosed Plate and Frame Filter Press is the answer.
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Letre 900 and 800 Filters
These large volume plate and frame filter presses are designed with internal feed and discharge porting. No gasketing is required and they can be used with a wide variety of filter media including media with different thickness specifications.

The Letre 900 and 800 filters are supplied with pneumatic/hydraulic closures standard to provide simple joystick operation. An automatic pressure setting maintains balanced pressure on the filter media throughout the entire production run. These units can accommodate up to 120 filter pads, providing a filtration area up to 930 sq. ft. (86.4 m²). Selection of inlet frame thickness will determine the volume of cake that can be accumulated and washed for product recovery.
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Letre 600 and 604 Filters
The Letre 600 & 604 filters are the industry standard for filtration of critical liquids. Letre 604 filters are fitted with four ports which can be configured for thorough washing. As with other internally ported filter assemblies, gaskets and washers are not required. In applications where sanitary designs are required, Letre 600 & 604 can be provided with BioClean™ filter plates.

Letre 600 & 604 plate & frame press units may be used with carbon and/or filter aid, or with pretreated filter aid to accommodate a wide range of processing applications. Selection of inlet frame thickness will determine the volume of cake that can be accumulated and washed for product recovery.

These large volume, 24 in. sq. (60 cm), plate and frame filter presses are designed to accept up to 100 filter pads, providing a filtration area of up to 319 sq. ft. (29.64 m²).
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EUS-400 Series Filters
The EUS filter is designed for mid-range batch sizes. It can accept up to one hundred 16 in. sq. pads providing up to 142 sq. ft. (13.2 m²) of installed filter area. The EUS filter is equipped with BioClean™ filter plates as standard. This eliminates all screw and internal threads, which reduces cleaning and sterilization time.
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2HS and 2HS-B Filters
These economical 12 in. (30 cm) diameter plate and frame filter presses are designed for a wide range of high efficiency, ultra fine filtration applications. They accept up to 40 filter pads and provide up to 25 sq. ft. (2.3 m²) of installed filter area.

Model 2HS is cart mounted and is available with a 40 pad capacity expansion option. Model 2HS-B is mounted on a floor level dolly and has a filter pad capacity of up to 12 pads.

Model 2HS and 2HS-B filters have the same component flexibility as other ErtelAlsop plate and frame filter presses. This includes sludge inlet rings for cake accumulation, dividing heads for multiple-step/one-pass filtration, sanitary fittings, special piping, gauges, pumps, and motors to meet a wide range of applications.

As with all ErtelAlsop internally ported plate and frame filter presses, gaskets are not required. The precise alignment of the frames seal the filter pad, paper, or cloth media, eliminating concerns about compatibility and cross contamination.
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BioClean™ Filter Plates
Designed to meet rigid cleaning validation standards, optional BioClean plates are ideal for all sanitary and ultra-clean depth filter applications. BioClean™ filter plates are an integral element in the ideal upstream filtration sequence that leads to successful downstream processing - up to and including sterile filtration of the finished product. The BioClean™ filter plate assembly consists of a frame and two screen sections. The screens are designed with a series of protrusions, or dimples, on opposing screens which make contact when the filter press is closed.

This action maintains the position of the plates without the need for welds or mechanical interconnections, and prevents the plates from bowing inward while under pressure during filtration. Cleaning and sterilization is fast and simple.

Our patented innovation is the only design that allows for ultra-high polishing of all liquid contact surfaces.
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