"I still have not got any DE yet but still trying.. "
Go ahead, and get the 25# -- it's not that much, and you need to check your filter. Once you get a working filter, you can use it to help clean up next time. But, I'm really suspicious that you do not, currently, have a filter in good order.

"Would the cause of dead algae be one of my cloudy reason and just settled to the bottom of pool.. "

Yes, and if your filter is non-functional, you could definitely remove it more, by letting it settle and then vacuuming to waste, than you could by filtering.

BUT, YOU'RE GONNA NEED A WORKING FILTER!! (Hint, hint ;-) If you don't get one working, you're gonna be unhappy every time you have a party, or a bunch of kids over, or what not . . . to say nothing of what will happen if you get a bit of algae. It's much easier to clean up a pool now, with cool water and few or no swimmers, than it is in mid June.

Ben