The efficiency of cooling towers and their related processes can be improved in many ways. One important way is to filter the cooling water, ensuring that any particulate capable of contaminating the process is removed. Two often used filtration technologies are bag filters and walnut-shell filters. Bag filters are a simple filtration option that can remove particulate in many different industries. Walnut-shell filters can remove solids and oils from cooling processes.
Bag filters are particularly effective when used to clean noncontact cooling water. This is usually water — sometimes with the addition of glycol — that does not come into direct contact with the process to be cooled. Despite the lack of direct process contamination, filtration is still necessary. Contaminants can enter the water system through the air in cases where the cooling pond is open to the elements. Pipe scale and a lack of clean makeup water also can introduce unwanted solid material into the system.