Removal of Chromates, Arsenic, and Other Contaminants from Cooling Systems
Removal of contaminants can be difficult. Arsenic typically remains in solution. Very thorough removal of the old fluid is necessary to reduce residual arsenic levels to non-hazardous levels. This often requires a partial system disassembly to completely drain machinery. It is also frequently necessary to remove fluid from high volume low spots such as large diameter buried lines leading to radiator systems. Circulation of an appropriate cleaning fluid is normally required but even this may not be completely effective at are moving some scales such as chromates. Mechanical cleaning of some lines and heat exchanger tubing may be necessary. In spite of all of these complications, with proper system evaluation and careful planning, a successful system cleaning and coolant recharge can be achieved.