Mark Barrett is managing director of Warden Plastics and Warden Biomedia. He is a qualified engineer who has specialised in plastics and polymers for over 40 years. Since joining Warden Plastics in 2004, Mark has overseen research, design, development, manufacture and sales of the Warden Biomedia range of plastic filter media, which are used for wastewater treatment, odour control and aquaculture.