Vinyl Pool and Calcium

[iwannapool]

In my situation I have plenty of lime in the water but no calcium. Would the lime act as the calcium would for protecting the metal in the heater; if calcium can and really does that?

[anotherpyr]

In my situation I have plenty of lime in the water but no calcium. Would the lime act as the calcium would for protecting the metal in the heater; if calcium can and really does that?

Lime is calcium.
http://en.wikipedia.org/wiki/Lime_%28mineral%29

[iwannapool]

Interesting? So why when I test for CH I get zero? It seems as if this test doesn't recognize it or ? I'm lost !