I need a literature review on water hardness. For instance

I need a literature review on water hardness. 

 For instance if you topic is hardness, search information related to this topic, such as:
– What produce hardness
– Advantages and disadvantages of hardness
– Treatment to remove hardness
– Water quality criteria for hardness
In summary, any information that you can find related to the topic

You can search for this information in any environmental Eng. book or in journal papers  

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