.177 ppm seems about right to me. That's high enough that I would consider using some GFO to reduce the level, although there are other approaches. Lanthanum chloride would save some money, but it forms a precipitate that should be filtered and exported, so it's not as convenient. You could try some GFO and see how the cost adds up over time. GFO can be regenerated, as another possible cost-saving approach.
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Jonathan Bertoni
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