Phib - I'm pretty sure the sludge volume plus DE filter is what has cause some of AWTs problems so don't worry about your own slam, just hit it hard the first few days, eg checking every 2 hours at first and filter 24/7 with your sand filter
AWT, floc *might* work in this case, but just remember that if it doesn't, eg if you can't get it out vacuuming to waste, that it will quite possibly clog your DE filter. Floc causes particles to clump. The same stuff that is in most brands of floc is also in a filter aid product I looked into once for iron and the mfg sez not to use with DE filters for this reason.
So if you've already added it, just be sure to get it all out or your DE use could conceivably increase or remain problematic for a bit. If you have trouble vacuuming to waste after, you may need to get the trash pump to get it out and clean the filter again.
And just so you know, its not that TFP is just hatin on floc. Its that
a) its usually unnecessary if following a slam and filtering 24/7, which is part of the slam rx
B) you have to turn off all circ for it to work and when you're slamming to a high level water should be circulating to be mixing in the chlorine
And
c) it just doesn't reliably work all the time, especially in extreme conditions.
If you are above slam level and your FC is holding b) isn't as much of an issue in your case, but to tell someone who comes to TFP to stop and floc, knowing that in warm water algae growth can far outstrip sanitation levels in a few hours, would be kinda irresponsible.
That's my take on why floc is not recommended here.
Let us know how it goes if you do it/ have done it. Our recommendations are based on avoiding unforeseen consequences and efficacy but at this point I think we're all pretty clear you need one way or the other to get the particulate out
