The solids are removed from an aq. suspension contg. 0.01-200 g solids/L using a suspension of a water-sol., high-mol. wt., highly crosslinked copolymer of di-Me diallyl ammonium chloride and 0.1-3 mol.% of a crosslinked comonomer, mixed with acryloguanamine copolymers. The crosslinking polymers are ammonium salts with >=2 allyl groups, e.g., Me triallyl ammonium chloride and tetrallyl ammonium chloride. The suspension is used at a rate of 0.005-2%, based on solids content, at 276-333 K and pH 3-9 to form a floc which can be sepd. by known means. [on SciFinder (R)]