calcium hypo vs. calcium chloride

[Oclat]

Hi,

I have a plaster pool which has a low calcium reading according to my recent test. It is at 160 and I need to get it up to between 200-400. I was using some cal hypo that was around 50% calcium, but recently bought some calcium flakes that says minimum 77%. My pool is approx 30,000 gallons. Does anybody know how to calculate how much 1lb of 77% calcium choride is adding to the pool in ppm? My CYA is at 35%, so I am using this as my sanitizer until I get to my 200+ Calcium reading, then bleach. And what is the difference between cal hypo & calcium chloride. BTW, the calc hypo was by ProGuard or something.

thanks,

Steve