Calcium Absorption

5 days ago I needed to raise my calcium level up with 35 lbs. Does anyone know how long it takes to completely dissolve or absorb? My water is getting clearer, while I run my filter around the clock, but I keep finding a white layer everywhere. It is as if it when I brush it and it gets recirculated it just ends up in the exact same situation that I find it everyday. One thought that I have is that maybe I should have added half the calcium at a time, allowing for absorption in between. The other idea I have is that I have not been adding DE to my filter because my water was not balanced (until today) and I am backwashing a few times a day to lower my filter pressure. Could it be the lack of DE at this point?

Thanks for any advice,
Shannon in VA