Do you have PVC film type ...

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Do you have PVC film type fills in your tower? You should first check the scale constituents based on cleaning methodology can be worked out. Is the scale only on fills or on your heat exchangers also? You can use some surfactant in combination with chlorine dioxide/hydrogen peroxide to clean the fills. Then adopt cooling water treatment program with suitable biocide/surfactant. Those require detailed assessment with water quality, system metallurgy, etc