What does Calcium Hardness really do?

[VWFeature]

They don't know what they are talking about. They are basically saying that if you don't have calcium, then just add sodium chloride salt and everything will be fine. That's baloney. Increasing conductivity of the water increases corrosion rates. Exchanging calcium for sodium is pointless at preventing corrosion. Why even waste your time with these people unless you are trying to educate them?

Agree. Which is more corrosive, ocean (salt) water or fresh water?

 

[Patrick_B]

Welcome to TFP,

In answering this specifically on its own, Sea Water without question. Whether it's in relation to corrosion by being more conductive in a metallic system, or deposited on things it can corrode it's Sea Water by far. Is there something more specific you're inquiring about?