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First of all thanks to those who answered.
Many said they use Quaker brand and have for many years with no bad effects. Some use the instant also.
Also recommended were Bob's Red Mill (but not the organic which is not gf) and Arrowhead Mills.
The following were also suggested:
Colavita
Carolina Plantation (see website)
Palmetto Farms (see their website for ordering)
Aunt Jasmina
Again many thanks. I plan to enjoy grits shortly.
Christy in PA
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