clarifer, recommended or not?

20k gallon 16-32 ig vinly liner pool. opened 3 weeks ago very black/green. sand filter
ive pounded it over the weeks with high fc readings and have tried to maintain a 3 or more fc daily. i have slipped onece or twice and its dropped to .5 to 1 so i shocked after this to 15ppm. (current cya under 10).

ive vacuumed several times and finally see the deep end drain. 85 pct clear on deep end-100% shallow end.
i get accumulations of dirt/sand looking silt where the floor contours. I vacuum and still feel like i get it a day or so later.I dont believe its sand from the filter but more hopefully dead algae. It appears to be a brown/dark green color. if i brush it i see the stuff flow away with the brush and darken the water up as i re-stir it all in. CC readings are always barley .5ppm. ive been running the filter but not 24/7 and more like 12-14 hrs a day.

if i shine a bright flash light in the water i see white particuate floating and its hazy.I learned a lot over the yrs but wanted some feedback on clarifers. Looks enticing to buy a 15 dollar clarifer and be able to vacuum all that matter floating in there away.

im having a hard time determining if i have new algae forming or if this is just the old stuff slowly falling and going way. If it is dead algae, how recommended are clarifers. ive always used the bbb method with results, but often longer and more taxing than expected.
thanks

You'll be able to tell if it's new algae forming by testing your water at night and again in the morning before the sun is up. If you're losing chlorine during that time period, then you're still fighting stuff in the water.

If you had a bad algae bloom to begin with, odds are that the stuff you're accumulating is dead algae. Have you tried vac'ing to waste rather than to filter?

We generally stay away from clarifiers, because so many of them will give unpredicable results. If you can vac any of the stuff to waste, and if your filter is catching any of the stuff (is the pressure on your filter rising between filter cleanings?), we really recommend just being patient and letting the filter do its job. Unfortunately, the pool didn't get swampy overnight, and it's not going to clear quickly either...

What size pump and size/type filter do you have?