Quote Originally Posted by smallpooldad View Post
CarlD,

Thank you for your quick reply.

It is concrete formed in place with plain white plaster.

Would it be correct to state, if I'm understanding you correctly, that if there were not enough calcium in the pool then the calcium measurement level would slowly rise; as it would be leached out of the wall, and/or the pH would rise to compensate?


Aloha

Almost, but not quite. The pH isn't rising to compensate, it's rising because calcium added to the water is alkaline and that increases the pH.

If you find you are having troubles with your FC dropping as well, for you, a good solution may be using tri-chlor pucks--they add CYA (and in Hawaii, you may want to run higher CYA because of the heat and sun) and they are very acidic, which fights the tendency of the calcium to drive pH up. But be sure to test your water every week and stop using the pucks when CYA hits your target, whereever you set it.

That's why, IMHO, in-line chlorinators are a waste of money. Floaters are $10-$15, and you only use them some of the time, until CYA requires stopping.