Pond Flocculants work by causing suspended particles in the pond water to clump together and fall to the bottom, whether those particles are single cell algae, clay particles, or other debris that may have washed into the water.  When you use a flocculant you can expect the water to clear from two thirds to three quarters of the way to the bottom.  Once settled the particles can be removed with a filter, through vacuuming, or by the use of sludge digesting bacteria.  Flocculants are generally a short term, though immediate solution to the problem of murky water, but the larger problems that are causing the turbidity should be addressed for the long term.