200# of salt doesn't seem like near enough. Did your pool guy do a test first to see if there was any measurable salt level in your pool to start? From my calcs, 200# should bring you to 1800 ppm. There is a definite possibility that the readout on your display there is off, and may be reading at the bottom end of its scale. You may want to get the water tested to see where you are really at.
However, if you want to go from 2700 to 3200, you'll need 54# of salt to do it. If you really are at 1800, then you'll need 151# to get there. As always, add half the ammount, wait a day, and then test to see where you are at. You don't want to overshoot, and the salt indicators on the SWC's are slow-responding by design.
Michael

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