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Percent inhibition determination after 6 hours is a reasonable index for evaluating the performance of additives.  However, I suggest providing precipitation behavior with time (data) that gives induction time of antiscalants.  This will identify the performance of different antiscalants in a more accurate manner.  
Following references might be helpful in this regard.
1.F. Rahman, ¡°Calcium Sulfate Precipitation Studies with Scale Inhibitors for Reverse Osmosis Desalination¡± Desalination, 319, (2013), 79-84.
2.Ali, S. A. I. W. Kazi, and F. Rahman, ¡°Synthesis of a Phosphate-Free Antiscalants to inhibit CaSO4.2H2O scale formation in RO Desalination plants¡±, Desalination 357 (2015) 36¨C44.

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