Materials approvals issued by WRAS are valid for a
maximum of five years. In order for a material to be
re-approved, further testing known as audit testing
Approval holders are notified of the need to apply for
re-approval when one year of the current approval remains. If the approval
holder decides to renew, WRAS will issue audit test requirements after
considering factors such as whether there have been any changes to the
material eg. formulation, method of manufacture and alternative
cases a full BS 6920 test is not required and the approval can be renewed on
the basis of satisfactory limited testing eg. Odour & Flavour of Water and
Growth of Aquatic Microorganisms Testing.
note that audit testing can only be carried out by the test laboratory after
receipt of the audit test letter from WRAS stating the test requirements.