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Water quality - C
Water quality - CCan any of the constituents of the pipe material leach over time into the water? Specific compounds of PE100 have been formulated for use in potable water applications. Extensive testing has been carried out by the pipe manufacturers and independent test laboratories to ensure that there is no risk to public health. PE100 is approved universally by national organisations for potable water use. Does PE pipe support microbiological growth? Microbiological or microbial growth (biofilm) on the surface of components in a water supply system is likely to occur irrespective of the material used. Treatment of water with chlorine or other substances may contribute to a significant decrease. The conditions or mechanism for formation of this biofilm are not fully understood, nor why some materials appear to support greater levels of growth. However it is generally accepted that this is unrelated to water quality at the tap. Studies carried out by PlasticsEurope indicate that the amount of cells present in the water is unrelated to the amount of biofilm formed on the internal surfaces of pipes. As a safeguard several European countries have well established methods for assessing materials for support of microbial growth, and plastics including PE100 which meet other requirements for water quality have no difficulty in meeting such requirements. Further research and the development of a harmonised method is being undertaken by KIWA in the Netherlands as part of the EAS Co-normative research programme. The experts have decided to work on an improvement of the KIWA BPP (Biomass production potential) test based on ATP (adenosine triphosphate) measurement using a static immersion method. In addition PlasticsEurope has been carrying out independent research using a method involving dynamic flow of water. The DVGW has also issued regulations regarding microbiological growth (DVGW Code of practice W 270)."
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