Cal-Hypo

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,879
Silver Spring, MD
1 lb of 48% cal-hypo adds 4 ppm of CH to 10,000 gallons.

This, and many other similar mysteries, can be discovered using my Pool Calculator (see the link in my signature).
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,879
Silver Spring, MD
The most recent version is at http://www.poolcalculator.com/. Down at the bottom is a section called "Effects of adding chemicals". Set it to 10,000 gallons at the top, and then add 16 oz of 48% cal-hypo in the Effects of adding chemicals section and it shows "will raise FC by 5.7 and raise CH by 4".