Hi, Dina,

Calcium has no effect on vinyl pools. You could use Clorox or Calcium Hypochlorite for your pool. Most of us don't use the pucks (tri-chlor)because they will, in the long run, cause some other issues.

The granules you used were most likely calcium hypochlorite.

It's always a good idea to include current test results when you post. There's some sharp-eyed experts here that might detect some other issues you may not be aware of.

How old was your old liner? What do you think caused it to fail?