Caerdydd yw'r ddinas neu'r dref ddiweddaraf yng Nghymru i ymuno â'r ymgyrch ail-lenwi. Bydd busnesau sy'n cymryd rhan yn cofrestru ar yr ap Ail-lenwi ac yn rhoi sticer ar eu ffenestr i ddangos i bobl sy'n mynd heibio bod croeso iddynt lenwi eu potel ddŵr am ddim.
Cardiff is the latest Welsh city or town to sign up to the Refill campaign. Participating businesses sign up to the Refill app and put a sticker in their window to show passers-by they are welcome to stop by and fill up their water bottle for free.