Hard Water Home › Forums › Public Forums › General Plumbing › Hard Water This topic has 1 reply, 2 voices, and was last updated 19 years, 8 months ago by DUNBAR. Viewing 1 reply thread Author Posts 14 Aug 2004 at 11:12 am #277327 Andrew Meyer What can I use to get hard water buildup from a Toilet bowl. Art retired plbg 14 Aug 2004 at 4:06 pm #295991 DUNBARParticipant CLR < Good Tri-Sodium Phosphate < Better Muriatic Acid < Best Be careful with Muriatic Acid. Will clean the jets and bowl like it is brand new if dump directly down the overflow of toilet. It is reactive to calcium buildup, so the more scale and buildup, the more the chemical works to remove it. “Your best interest is secured by making the right decisions the first time.” Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In