Have a read, pages 78 and 84 in particular. Significantly higher rate of impurities in the raw brine, compared to ETL's, with the exception of Boron. They bring those impurities down to a 0.2:1 Li ratio through a variety of chemical softner and purifying techniques, including boron ion exchange method.
It's a recommended technical read. IMO, the impurities listed in the last KPI news release, are not an issue, by any stretch of the imagination. I'd be curious to hear what others think.
P.S. Great timing
My19sixyNineZ on your last post. It saved me from covering their Southwest Arkansas Prefeasibility Study.