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The Computer Controlled Sedimentation, Precipitation and Flocculation Unit, "SPFC", has been designed by EDIBON to study the parameters that affect the physicochemical treatment of wastewater for purification. The objective of the unit is to reduce colloidal and suspended matter by studying the precipitation, coagulation, flocculation and sedimentation stages. The process starts with the supply of water to be treated to the unit, using the raw water a computer controlled supply pump for that purpose. The supply flow is obtained with the flow sensor. The raw water is introduced into the precipitation tank, where a computer controlled pump adds dissolved caustic soda to neutralize that water. Besides, there is an adjustable speed stirrer that facilitates the mixture of the reagents associated to the neutralization reaction. It also includes a temperature sensor and a pH-conductivity sensor to control the key variables of the precipitation process. Then, water overflows onto the flocculation tank, which is divided into two parts: the coagulation tank and the flocculation tank. Water overflows from one tank to the other. The difference between them is the type of compound added for t