Dear Stephen  Would be ...

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Dear Stephen 

Would be useful to know the analysis of the raw water , including the turbidity and SDI , the concentration factors at each evaporator ,  and the final rejected water analysis  to better estimate the required solution.

We may add the frequency of cleaning , what are you cleaning with,  and what you get from the cleaning (what is the type of deposits you get). Cleaning solution before and after cleaning  analysis would be of a great value.