The principle is the addition of coagulant me Zealand (Coagulant) as Alum (Aluminum Sulfate) into the water to make colloidal many particles captured by a group called The Flock (Floc) and heavy and can settle down quickly.
The principle is to add substance, coagulant (Coagulant) such as alum (Aluminum Sulfate) into the water to catch หลายอนุภาค colloid group. Called the flock (Floc) until the weight and settling down quickly.