Manganese and iron, which are found in tap water in many parts of the country, can cause orange to brown stain. When the stains are black or dark brown, as in your toilet, manganese is usually the ...
people mistake pinkish red stains for iron, but a bacteria known as Serratia marcescens may be why there are pink ring stains in your toilet. One way to distinguish these stains from rust is by ...
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