product weight and their dosage is based on dry weight of coated broke fig1 clearly demonstrates that polymer c polymer d and polymer e which are blends of polymer a and b in various ratios exhibit the highest turbidity reduction per product dose in particular polymers c d and e have a higher efficiency retention obtained at a fixed polymer dosage than polymers a and b individually the activity of the blends depends on the weight ratio of their product components the optimal one depending on the nature of the coated broke treated furthermore it was found that the retention activity of polymers a and b added separately to the broke is lower than that of polymers c d and e in which the two products are premixed in particular addition of 1 kg ton of polymer c produces a turbidity reduction of 76 6 whereas polymer a and polymer b added at the same time but separately to the broke at a dosage of 0 5 kg ton each give a turbidity reduction of only 53 5 addition of polymer e at a dosage of2 kg ton produces a turbidity reduction of 92 8 whereas individual addition of polymer a 1 5 kilogram ton and polymer b 0 5 kilogram ton to the broke reduces the turbidity of only 88 8 as can be seen from the viscosity data reported in table i the viscosity of polymer b varies when.