
The main difference comes in when you have to get those clumps out of your pool. Whereas clarifier brings the particle clumps to the top and leaves your pool filter to do the heavy-lifting, floc requires some elbow grease on your part.
Once you’ve added flocculant to your pool, you’re left with a ton of clumpy gunk on the floor of your gorgeous pool. Yuck. From here, it has to be vacuumed up. By you. Yep, that’s where we come to the downside of floc.
Flocculant works really fast, but… it requires a bit more effort on your part. In fact, you actually can’t even use an automatic vacuum for this one. You have to do it manually on “waste” mode, which means you’ll be removing water from your pool.
The real advantage of flocculant is its speed in de-clouding your pool. If you don’t have days to wait for clarifier to work, you should definitely give floc a try. Whether you’re planning a pool party for the next day or just don’t like to wait, using floc will be your best bet.
There you have it: fast-acting flocculant with added manual labor versus slower-acting clarifier with no work on your part. The choice is yours.
Source from https://trello.com/c/7cIEoK2t/35-the-best-pool-clarifiers-of-2020