Question

whuch type of method should take to convert soft water to hard water?

Answer 1

Hey____ dear Good Morning here is your answer ⤵⤵ ⤵ ⤵
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Soft water (as opposed to softened water) is water with low (or no)   mineral content. There are two ways to reduce/remove minerals from hard water:

Filter it with Reverse Osmosis (RO)
Distill it.RO will give you 99%+ pure water. Distillation will give you 100% pure water. Either way, the water will have little or no mineral content.

Water softeners are different. They use a process called ion-exchange to exchange mineral ions in hard water for sodium or potassium ions. Since softened water still contains minerals, it's not soft water.

Hope it helps :-)
Have a nice day.

Thanks by
__________
Vijaya Laxmi Mehra

Cheers:-)