for existing customers, where there have been no failed tests for a particular fines waste stream, the testing cycle before 1 April 2018 will continue
ar gyfer cwsmeriaid presennol, lle nad oes unrhyw brawf colled wrth danio wedi methu ganddynt ar gyfer ffrwd wastraff gronynnau mân benodol, bydd y cylch profi cyn 1 Ebrill 2018 yn parhau