How much Calcium do I need?

[chem geek]

Carl's idea is a great one (wish I'd thought of it!). If you were to add one pound of 65% Cal-Hypo to your 15,100 gallon pool, it would increase the Free Chlorine (FC) by 5.1 ppm and would also increase the Calcium Hardness (CH) by 3.6 ppm. Though it won't get your calcium up quickly at least it's in the right direction and it does give you the option of another chlorine source -- one that is sometimes less expensive than liquid chlorine.

Richard

[CarlD]

I'm always a big fan of: If you don't know if you should add more, or less of any chemical, add less--except for chlorine--add more.

But powdered chlorines are not just chlorine, so I like the "go slow" idea.

The whole point is if you put too much of just about anything in your pool you have to now do something else to fix it. If you put in too little, you add more.

Except for bleach. Too little you get algae (BIG bad!), too much you may bleach your liner (little bad), if you have a liner.