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Longworth’s patented filter cleaning system


DEECOM ® uses superheated steam to gently remove a range of polymers from filters and related production equipment.

How does DEECOM ® work?

The DEECOM® process uses a combination of superheated steam pressure swings or compression/decompression cycles to remove frozen polymer from contaminated components and assemblies. The process takes place in a controlled environment contained within a custom designed pressure vessel.

The components to be cleaned are enclosed in the pressure vessel and the pressure in the vessel is then rapidly decreased by opening the blowdown valves. Depending on the polymer type, temperatures above 250oC will melt or soften the polymer and a degree of hydrolysis will occur.

When at pressure, the steam will penetrate fissures in the polymer where it condenses as superheated water. On decompression, it boils, instantly cracking the polymer and carrying away broken particles along with the softened, degraded polymer fragments from the outer faces.

The pressure swing cycle is then repeated at frequent intervals and controlled automatically with no detrimental effect on the integrity of filter media or metal structure.

Our DEECOM ® range

To date, Longworth Engineering has built and commissioned DEECOM® systems on three different continents for a wide range of clients.

The smallest machine we have supplied was to a well-known North American filter manufacturer and had a vessel capacity of 20 litres. The largest machine to date was built for a Korean high-quality PET film producer and had a process vessel volume capacity of 3500 litres.

Using computer aided design techniques and modern manufacturing process, Longworth can build virtually any configuration to suit our customers’ individual needs.

Longworth Deecom


  • Using computer aided design techniques and modern manufacturing processes, we can build virtually any configuration to suit our customers’ individual needs
  • Polymers which can be successfully removed from filters and production equipment include polyethylene teraphthalate, polyethylene, polyamide and polycarbonate
  • Longworth offer full tests and trials processing from our UK base using our own equipment


  • Removal of all traditional solvents, such as TEG and DEG from the cleaning process
  • Reduced overall cleaning stages leading to reduced overall energy usage and lower overall cost of ownership
  • Proven to be environmentally friendly
  • No solvent to dispose of
  • Improved cleaning capability
  • Easy to use and operate
  • Regeneration of out of use filters by gently removing contamination that is embedded in previously inaccessible areas

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