Director/PDMR Shareholding

Tristel PLC
04 April 2008



                                  Tristel plc
                          ('Tristel' or 'the Company')

                             Director Share Purchase


Tristel plc, the AIM listed provider of infection and contamination control
products, announces that on the 3rd April 2008 Peter Stephens, Chairman of the
Remuneration Committee and Non-Executive Director, purchased 25,000 Ordinary
Shares in the Company at 39 pence per share.

Following the above purchase Mr Stephens has an interest in 1,085,681 Ordinary
Shares in the Company, representing 4.04% the Company's issued share capital.



Contacts:

Tristel plc
Paul Swinney, Chief Executive                     Tel: [phone]

Daniel Stewart & Company Plc
Graham Webster                                    Tel: [phone]

Parkgreen Communications Ltd                      Tel: [phone]
Lucy Lake                                         Mob: [phone]
                                                  [e-mail]



Notes to Editors

Tristel's core business is the marketing of its proprietary chlorine dioxide
chemistry that is highly effective in destroying all types of bacteria
(including C difficile, MRSA, bacterial spores, and tuberculosis), fungi and
viruses and is one of a small group of sporicidal agents that is safe and easy
to use.

Tristel plc operates with two divisions, Tristel Solutions and Tristel
Technologies.

Tristel Solutions focuses on infection control products for NHS and private
sector hospitals, primary care trusts, community hospitals, private practices,
dental practices and veterinary establishments. The Company's products are used
on instruments, surfaces, and the skin in over 375 UK hospitals, representing
some 60 per cent of all UK NHS Acute & Private Hospitals.

Tristel Technologies provides products for Legionella infection control in
building water systems and for contamination control in the food growing and
food processing industries. Tristel Technologies has approximately 200 customers
in the government, municipal, industrial, healthcare and food sectors and more
40 UK hospitals where its products are used for Legionella control.





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