Ok, so I added 3 x 1.42 Gallons of 6% bleach and did a chlorine test after 1 hr. The results show somewhere in between 3 and 5ppm. I did the dilution method that you mentioned and got the results to be 5ppm. So I would think its about 4.5ppm currently. Its 104 Degrees hot here in Phoenix, so may be all the chlorine that I put might be evaporating faster than I can pour!
I brushed the pool a bit. Didnt backwash the filter yet, Did backwash and added DE just two days ago.
The pool has bit of powdery particles floating on top, Dont know if its due to me brushing the pool and some DE is floating or if its the bleach reacting with Algae. And the fact that my pop up cleaning system is not really popping up and cleaning makes me worry.. Should I be buying a vacuum cleaner? Other than that how will I remove the debris? And how can I make sure my drain is working? I can not see much of water movement at the deep end of the pool. Could it be that my drain is somehow clogged?

Here is the picture of partcles floating on the top