At the cooling water treament the main task beside the avoiding of sedimentation an corrosion is to beware of microbiological contamination. Meanwhile cooling systems are indispensable for a lot of processes, so there must be a certain and durable function warrented. Each plant, an air conditioning system or a process cooling, has completely specific parameters, which have to be kept and supervised. Calc sedimentation have a intense isolating effect (reduced heat transmission) and are able to block the water flow so far that a system operation is not possible.

Heat exchanger and piping in a cooling system are permanent threatened by corrosion. Metalls incline to corrosion, when they are exposed to air (oxygen corrosion), water or other metals. The corrosion of materials is detected in "mm" material abrasion per year. Basicly the corrosion is affected by the factors temperatur, water velocity, galvanic element education, existent sediments and the relation of anodic to cathodic face.

An effective corrosion and control of sedimentation is dependent on the microbiological contamination of the cooling system. Ideal conditions for microorganism as algae, fungi, germs, bacteria, etc., are warm water, a pH- value between 6,0 and 9,0 and the availability of nutriment. Those conditions are given in the most cooling systems. A handling of the cooling system with algicides and bactericides is in lots of cases the condition for a successful treatment of the cooling water. 

To operate cooling systems continous and proftable, the water chemie and the monitoring of the system parameters are an important criterion. The main system parameters for a system monitoring are:   

• the  temperature difference (Δt) of the heat exchanger 
• temperature of water circulation 
• pH-value of water circulation 
• readings of electric conductivity to fix the factor of thickening 
• control of the proportioning pump 
• control of the cooling water chemicals.