You really don't want to use floc unless you can vacuum to waste. I'd even go so far as to say you'd be better off jerry-rigging up a submersible pump to the end of a vacuum pole and using that instead of the pool plumbing. Here's why flocs can be bad -
A flocculant is a form of coagulant that captures fine particles and then forces them to settle out along with the floc agent. Floc's can be aluminum compounds or iron-based ones. You are essentially adding the chemical to the pool in a dissolved liquid state and then the chemistry of the pool water causes it to agglomerate into larger particles that are more dense than water and sink to the bottom. Here's the issue though - floc's are not stable chemical structures. Over time, the coagulated floc compound will chemically breakdown and then release whatever particulates that were caught up in it. Over-floc'ing the water, using too much floc, can actually have the opposite effect where the floc forms and then starts to breakdown immediately. So it is imperative to use the exact concentration required to form a floc (which is usually done through empirical testing on actual water samples) and then you need to get rid of the settled floc as quickly as you can. Anything leftover will eventually decompose and release all the particulates it captured. Because of this, you never want to filter a floc because you will embed it in the filter media and as it's concentration grows and exceed the maximum limit, the floc will breakdown and your filter will release a constant stream of dirt and debris.
