What is the purpose of measuring calcium, magnesium hardness? why tap water have 0 temporary hardness?
check the wiper arms, they might be binding or the switch is bad.
1) Hard water is not suitable for washing clothes some other works. while it's recommended you to drink water which is hard to an extent, soft water should never be carried in lead pipes because poisonous Pb(OH)2 evolves dissolves in water. So,u see that for various purposes we need to know whether the water is hard or not,and if it's hard, then to what extent. That is why,measurements of hardness of water is necessary. 2) I don't know.
Hard water can somewhat be cured by all three, BUT the only real cure is a good water softener device. There are small ones that can attach to your sink if your hard water comes and goes. I run a full in system machine with salt and anti-rust agents only because I want it good all the time.
