Afloccule; a soft or fluffy particle suspended in a liquid, or the fluffy mass of suspended particles so formed.
2005 February 27, Fred A. Bernstein, “In My Backyard, Please: The Infrastructure Beautiful Movement”, inThe New York Times[1]:
It might seem that Mr. Holl, whose initial sketches are glorious watercolors, was an unlikely candidate for a job that is all about hydrodynamics. But he credits much of his inspiration to repeated meetings with engineers -- as many as 30 at a time -- to discuss topics like "flocculation" (the process by which particles form coagulated masses, orflocs).
(informal) Aflocculant, as used in swimming pools to make particles clump together so they are trapped by the filter.
2023, Kristine Blanchard,Pool Care For Dummies, page291:
This can happen for a few reasons, such as adding too muchfloc or adding too much algaecide prior to floccing.