It provides useful calcium ions for healthy growth of teeth and bones.
It tastes better and is thought to reduce the number of heart illnesses.
Hard water contains lots of calcium which is good for strong bones and healthy teeth.
Also hard water can prevent Heart disease.
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Hard water can be good for fish and live plants because it has minerals in it that you don't get in bottled water. It is good to give your fish half tap water(treated with conditioner) and half bottled water. This gives your fish and live plants minerals to help them grow. You can use 100% tap(hard) water but it must be treated with water conditioner for fish.