by way of derogation from point (c), from 11 December 2017: chlor-alkali production in which mercury is used as an electrode;
de mhaolú ar phointe (c), ón 11 Nollaig 2017: le haghaidh táirgeadh clór-alcaileach i gcás ina n-úsáidfear mearcair mar leictreoid;