The Water Efficiency Labelling Scheme (WELS) has been introduced by Public Utility Board (PUB) since 2006 on a voluntary basis. From 2009, the scheme has become Mandatory and was managed directly by PUB.  The scheme is applicable for all water fittings such as pipes, pipe fittings, valves, taps/mixers, urinal flush valves/waterless urinal, flush valves for WCs, dual-flush low capacity flushing cisterns, etc. for use in potable water service installations in Singapore. Additionally, water fittings such as taps/mixers, dual-flush low capacity flushing cisterns, urinal flush valves/ waterless urinal and appliance such as clothes washing machines shall be labelled under the Mandatory Water Efficiency Labelling Scheme (WELS) before they can be offered-for-sale, displayed, advertised for sale/supply in Singapore.

With effect from 1 April 2018, all water fittings, appliances, apparatuses and products covered under Water Efficiency Labelling Scheme, shall be certified by an Accredited CB for WELS. Admaterials Technologies is of the accredited CB that can provide the certification. The process of the certification is outlined in the following diagram.