I got this cool pump the other day to increase my water pressure. When the guy was installing it he had to cut out part of a copper line where the pump would go. Before re-connecting the pipe he tapped it with a hammer and you would not believe the crud that was coating the inside of this pipe. It came right out with the hammer taps but it must have been 1/4" thick all along the inside of this 1" or so pipe. I was shocked. A friend suggested adding muriatic acid to the cistern and to the tinaco on a regular basis to both disolve the existing crud but also to keep new crud from attaching. He likened this to treatment of a swimming pool. But of course he did not know how much to add or how often based on the volume of the cistern and tinaco. I called my pool guy in Florida who thought I had two heads. He advised not to drink the water. I guess the biggest danger is, hell I don't know what the danger is as long as you keep it out of eyes and mouth. Any ideas, suggestions or advice would be appreciated. If this sounds good I need a recipe. Thanks, T.J.