Hi Allmar, glad the floc is showing some improvement, wish it had completely dropped out
You gave it a good 24 hrs with pump off, right? Also assuming your keeping the FC up...
I am going to share a link to a thread by a person who got a bad batch of sand from the same mfg. you used this summer so that you can look at the pictures of the sand... because on the off chance the same thing has happened to you, the company may help make it right, per comments in the thread.
Eg. By my calculations you were probably spending in the neighborhood of $12 a day or more on chlorine for 21 days...which is sometimes what it takes, but it's reasonable to hope a clear pool at the end of the process
Slams are always a 2-part process...kill the algae/sanitize the water-- that's the chlorine's job--...and filter to clear...the filter & sand's job in this case. If there's any chance the new sand is exacerbating your efforts, I'm hopeful you could identify and resolve the problem.
Cheers to clear...I promise once you get there, you will love your pool
Links - the TFP poster who documented a bad batch with pctures:
My findings on how not all sand is created equal
This second link shows a few reviews that suggest a few people had problems with this sand clouding their water:
Amazon.com: Customer Reviews: Quikrete Pool Filter Sand Swimming