Grant of Patent

Tristel PLC
20 March 2007


                                   TRISTEL PLC

                                 Grant of Patent



Tristel plc ('Tristel'), the AIM listed provider of infection and contamination
control products, announces that it has been granted a patent from the UK Patent
Office for its Chlorine Dioxide Generator, known as the Tristel Generator.


The Tristel Generator delivers the company's proprietary chlorine dioxide
chemistry, which is highly effective in destroying all types of bacteria
(including bacterial spores, tuberculosis and MRSA), fungi and viruses and is
one of a small group of sporicidal agents that is safe and easy to use.


The Tristel Generator is used to produce a high-level disinfectant for
endoscopes and dental unit water lines as well as producing bacteria-free rinse
water for instrument washer-disinfectors.  It is also used for biofilm
elimination and Legionella control.  The Tristel Generator produces a continuous
supply of chlorine dioxide, at concentrations that are set by the user and can
be varied manually irrespective of the water flow.


Tristel's core product range of instrument disinfectants has become the market
leader in the UK Acute & Private Hospital sector. They are used to decontaminate
heat sensitive endoscopic and ultrasound instruments in over 375 hospitals,
representing some 60 per cent. of all UK NHS Acute & Private Hospitals.


Contacts:

Tristel plc                     Parkgreen Communications Ltd

Paul Swinney                    Paul McManus
Chief Executive                 Tel: [phone]
Tel: [phone]              Mob: [phone]
                                Email:[e-mail]



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