Waterbear,

My pool has a vinyl liner, so I haven't been testing for calcium. How does a heater change the need for calcium? Is it a scaling issue? I have read items suggesting that calcium is needed for pool plumbing, but I didn't understand the rationale.

If that's the case, what should be my target calcium number in ppm?

The heat pump I've selected has a titanium heat exchanger (the unit is by Jandy).

Does any of that change the equation or advice?

I appreciate your comments.


Zaphod