B,

If it were me, I'd go ahead and backwash now as Marie suggests. Get the pool clear by keeping the chlorine up and then consider backwashing it once again before you bring the chlorine up to "shock" levels. My reasoning for this is the "milky" water. I'm thinking the milky substance will all eventually get caught in the DE and you don't want it hanging around in there to only precipitate back out after you shock. Backwashing again is a must if you use the floc.

Dave