How to Maintain a TES Tank: Water Treatment and Thermocline Audits Maintaining a TES tank means a water-treatment programme (oxidation, biocide, filtration), periodic liner and coating inspection, bolt-torque and gasket checks, insulation and freeze verification, and thermocline audits. Untreated chilled water can grow biologically and a thickening thermocline silently erodes usable volume. Center Enamel has no published TES delivery; its large-bolted-vessel builds show shell