I used cal hypo in my plaster pool for awhile because I needed to raise my calcium. I have a 50 pound container that I used about 5 pounds of to raise CH by 50 ppm.Your description is confusing. I can't understand how you can not raise calcium I f you are using cal hypo. How are you testing? Test strips or a good drop based test? How are you adding the cal hypo? Broadcasting onto the surface, through the skimmer? What kind of filter?