High Performance Liquid Filters

• Recycling
• Final Effluent Improvement
• Membrane Protection
• Cooling Tower Circuits
• Water Treatment Inlet Works

The technology at the centre of each Cross Filter is a stainless steel spiral coil with raised nidges on the surface which produces a precise filtration gap. Liquid can pass through the gaps in the coil but particles above the required filtration rating are trapped. The trapped particles are washed away quickly and thoroughly by backwashing, reversing the flow across the coil, forcing it to open slightly and completely flushing any debris out of the system.

Demonstration and Test Rig

The Filter Test and Demonstration facility at the Bath factory is a permanent display of the quality and versatility of our range of products. Visitors are encouraged to attend demonstrations of the wide range of filtration problems which can be simulated using the various test rigs available. In this way, the performance of the equipment can be closely monitored and witnessed first hand. Filtration trials on customer's actual problems can also be set up on the rig if a sample of the fluid is available in sufficient quantity.

Cross Filtration Technology

Zero Gravity Coil

Cross Filters are the result of years of research and development into the manufacture of a coil which could filter solid particles efficiently yet minimise the loss of liquid during the backwashing, self cleaning process. The result is an innovative design and manufacturing process that produces a coil that plays two distinct functions:

Precise Filtration

Raised nidges on the surface of the coil ensure a precise filtration gap allowing fluid to pass through but trapping any particles above the required filtration rating.

Opening for Cleaning

Left
A conventional coil, shown here extended, opens with uneven gaps along its length presenting unequal openings to the flow during backwash.

Right
The patented zero gravity coil opens evenly along its length during the backwash process. The result is complete and thorough cleaning with minimum use of liquid.

Filtration Ratings

The coil is assembled onto a cage to produce the element which is integral to all Cross filters. Filter elements are available in seven different micron ratings: 12, 25, 50, 75, 125, 200 and 400 and are completely interchangeable. In some heavily contaminated systems, it may be advantageous to install a set of coarse or 'commissioning' elements in the early stages of the filter operation and replace them with finer elements at a later stage once the backwash frequency has stabilised. For more information about selection of Filtration Rating, refer to the Product Data Sheets.

100% Cleaning with Every Backwash

Filtering (left) / Backwashing (right)

The zero gravity coil design enables filter elements to be completely cleaned with every backwash, minimising backwash frequency and liquid loss.

Quality Assurance

Cross Filters are built to stringent Manufacturing Procedures under the BS EN ISO 9002:1994 Quality Control System. The Company adheres to strict environmental guidelines reinforcing an active policy of producing high quality, long lasting components. The zero gravity coil is an excellent example of how ingenuity can help eliminate the need for wasteful disposable filtration methods.

Product Summary - which filter?

A range of Cross Filter products is available to meet applications of virtually any size and complexity - all using the Zero Gravity Coil to provide permanent, economical and environmentally sound filtration solutions.

1. EasyClean Low cost water filters for domestic, light commercial or similar applications at flow rates up to 1.3 l/s. Each filter element is housed in its own flask and several can be connected in parallel should an increased capacity be required. The EasyClean is available in three versions: Manual, Valve and Auto. The EasyClean Auto can be elapsed time or differential pressure operated. The standard EasyClean filter is suitable for pressures up to 8 bar and temperatures up to 50ºC.

2. Winchester Tough and compact low flow, industrial filters designed specifically for closed circuit applications. The Winchester houses two filter elements which are backwashed sequentially under manual or automatic control without loss of system liquid. The Winchester Auto operates by elapsed time or pressure differential. The standard Winchester operates at flow rates up to 1.6 l/s, pressures up to 10 bar and temperatures up to 90ºC.

3. Phoenix Versatile and compact filters made entirely from stainless steel and plastics, designed to operate at flows up to 18 l/s. The Phoenix has six filter elements and flow is uninterrupted during backwashing. A turbo inlet flow design dramatically improves filtering performance by minimising backwash frequency. Backwash is triggered automatically by elapsed time or differential pressure and offers a manual override. The standard Phoenix is suitable for temperatures to 90ºC and pressures to 10 bar.

4. Forced Sedimentation Forced Sedimentation Filtration Systems (FSFS) combine Cross Filters with a sediment gathering system to produce a packaged solution to the problem of fouled pipework systems. Available with Phoenix for open circuit and Winchester for closed circuit applications, the FSFS collects a high concentration of sediment in a specially designed vessel to provide a more efficient alternative to conventional side stream filtration.

5. System 2000 The System 2000 offers an economical solution to high capacity filtration problems. The all stainless steel, modular design can be accurately tailored to meet the requirements for any size of project. Each filter pod houses seven elements and generates a turbo effect to minimise backwash frequency. The pods are arranged in banks of four or five and are connected to upper and lower manifolds as necessary to provide the required performance.

Filter Perfomance Summary

This chart refers to standard products only. Non standard products and materials may also be available at special request to meet specific applications.