water contamination

Hi, I need a sanity check please. Developed a pinhole leak in a watts etx-30 expansion tank, about a year old. Contractor is coming back today to replace it. Googling the model, it appears this is a non-potable unit. However, it's been installed on a branch of the cold water line that...

Would very much appreciate some feedback on some well water treatment issues. We have a whole home treatment system consisting of 1) small plastic sediment filter 2) large standing stainless filter containing both activated carbon (top) combined with Manganese Greensand (bottom) in one unit 3)...

hello everyone. i recently discovered that the water supply line to my toilet (that feeds the upper tank) has developed black mold. this is what the other side looks like (inside of the shut off valve coming out of the wall): what concerns me, is this: to my knowledge there aren't any...