Residue left in bucket after dissolving Cal Hypo--throw it in or throw it out?!

I normally use liquid pool shock for all my chlorinating, but when I checked my calcium hardness, it was 120. I have a vinyl pool and I know it's not a huge deal, but I figured I could use some Cal Hypo periodically for chlorination in order to bump up my calcium without impacting the CYA. I found a great price on 73% Cal Hypo that is about equal to buying a bottle of liquid shock for $2. Here's my question--in the past, I always am left with a white, dusty residue after dissolving Cal Hypo in a bucket. No matter how much I stir, it always seems to settle out to the bottom eventually. Is this the calcium? A binder? Should I just dump it out because it no longer has the "good stuff" in it? Or is there still stuff in there that needs to dissolve? I just remember when I had my little Intex pool, that there would always be white gunk on the bottom of my pool after shocking. I hated it!

24,000 vinyl pool, CYA 40, TA 110, CH 120, Ph 7.4, FC 5, CC 0, Borates 40 ppm

I am pretty sure it's the calcium. When I add cal-hypo I put it I'm my skimmer and then swish the skimmer housing until it all disappears. My instinct says to just keep diluting until it's gone, but that's instinct.