Biofilm is a collection of microorganisms that adheres to surfaces, and secretes a protective and adhesive matrix, in water systems. 99.5% of bacteria in water systems are found in the biofilm, which provides the ideal environment and nutritional conditions for proliferation.
If left untreated, the bacteria multiply, forming aggregates that detach and contaminate the outlet. If bacteria are detected, Delabie’s Biofil terminal filters will secure the outlet’s water quality. Although they are highly effective short-term solutions, filters do not address the contamination source, and a more permanent approach is required. Regularly reviewing and updating system schematics will identify and eliminate system deadlegs and dead-ends where bacteria thrive. A daily duty flush will prevent water stagnation, especially in low usage areas. Installing a Tempomatic 4 electronic tap with automatic duty flush at the end of a pipe run avoids the need to flush every outlet manually. Delabie’s Securitherm mixers have smooth interiors with fewer niches where bacteria can adhere, and Bioclip models are easily removed for cleaning and de-scaling. Removing scale deposits reduces biofilm build-up, and minimises the risk of contamination by Pseudomonas aeruginosa. Circulating water at high temperatures is effective in eliminating Legionella bacteria. However, to ensure patient safety, TMV3- approved mixers – such as Delabie’s Sequential Securitherm range with integrated thermostatic mixing valves – will prevent scalding at the outlet. Opening with cold, potable water, Securitherm’s temperature limiter and cool-touch surfaces prevent accidental scalding. It may not be possible to eliminate the biofilm that harbours pathogens, but good system management, and correct product choice, will help control contamination risk.
Delabie UK Ltd 7, Henderson House Hithercroft Road Wallingford Oxfordshire OX10 9DG
Tel: 01941 824449
Email: carole.armstrong@delabie.co.uk
