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what are used as an alternative to CFC's?

harmful UV light that reaches the Earth can cause..

what happens when a CFC molecule is hit by a UV light?

what is soft water and what is hard water?

what is hardness in the water caused by?

what is the difference between temporary and permanent hardness?

what happens when rainwater contains dissolved carbon dioxide?

what does insoluble calcium carbonate deposit as?

what two methods can be used to remove permanent hardness from water?

why are the calcium and magnesium ions removed from the water?