UK Drinking Water Inspectorate (DWI) approval requirement for non-metallic materials in contact with drinking water under the Water Supply (Water Quality) Regulations.
DWI Regulation 31 is the UK Drinking Water Inspectorate approval requirement for non-metallic materials in contact with drinking water under the Water Supply (Water Quality) Regulations 2016. The NSF-61 certified HDPE variant of the hexagonal floating cover satisfies Regulation 31 for contact with potable water in UK water utility service reservoirs.