what is the reason behind the formation of a white deposit on bathroom walls

If water you are using are with high calcium content, you will see these deposits on the water shower or faucets in white colour. When somebody say you have hard water - this is what it is ? PLEASE THUMBS UP !!
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Due to  the presence of calcium in water at high level , there is a formation of white deposits on bathroom walls . 
                                             PLEASE THUMBS UP !!!               
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