Questions regarding the data parameters of the water tank in evaporative air coolers

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In my workshop, evaporative air coolers are widely used; water is pumped into the upper water pipes from a water pump inside the water tank. The coolant flows through several nozzles to cool the coil before being collected in the water tank for reuse. The make-up water is process condensate. The pH is 7.5 and the ammonia nitrogen level is 5.6 mg/l. I am currently looking up relevant information. The workshop requires the teams to thoroughly replace the evaporative chiller water tank every ten days and to prepare analysis data. The analyzed parameters are PH, ammonia nitrogen, calcium hardness, chloride ions, and iron ions. However, the data obtained from each analysis varies. It is not possible to monitor the normal water quality of the tank. I would like to ask fellow sailors: are there any relevant standards that can be used as a reference? Strict criteria are set for each of PH, ammonia nitrogen, calcium hardness, chloride ions, and iron ions. First, thank you all.