Quote Originally Posted by George in Georgia View Post
The info that came with the liner wants total alkalinity at about 100 ppm, and calcium hardness at 100 ppm minimum. I seem to recall reading either on this site or another similar one that calcium is unnecessary for a vinyl pool. Any comments?
Regarding the issue of calcium in vinyl pools--that info was probably just advice the printer was told, rather than based on any good reason....HOWEVER.... In all actuality, it won't hurt for CH to be 100, it's easy to get it there if you're using cal-hypo for chlorination or shocking, and it's possible that there's some form of calcium in the makeup of the liner that you have that would require it to be present in the water. If the warranty ever might become an issue, then I guess it would be better to keep the water levels where they want them, even if there's no solid reasoning behind it!

Janet