floc

noun

1. (countable, uncountable)A floccule; a soft or fluffy particle suspended in a liquid, or the fluffy mass of suspended particles so formed.

   “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, or flocs).”

2. (countable, informal, uncountable)A flocculant, as used in swimming pools to make particles clump together so they are trapped by the filter.

   “This can happen for a few reasons, such as adding too much floc or adding too much algaecide prior to floccing.”

verb

1. (informal)To use a flocculant in (a swimming pool).

   “This can happen for a few reasons, such as adding too much floc or adding too much algaecide prior to floccing.”