Good afternoon. I tell you, I am living in a house a few months ago, the house is about 40 years old and the water pipes are hydrobronz, a week ago that almost no hot water comes out, just cold. Today a plumber came and told me that it is covered with tartar (he showed me the pipes and yes, they were covered). The question is, he told me that I should change all the water pipes, is it correct or is there a way to uncover the scale of the hydrobronz pipe? Greetings and thanks!