In aero I seldom go above 750ppm. If pushed to 950ppm for a few days and quickly got some burnt tips, then dropped back down to 750 and all was well after that. I'd say DWC should be pretty similar, and a good place to start is around 650ppm. Then you can push it by 50ppm increments if you want to see where it burns. But often times lower ppm's can give you better yields and growth than the tippy top of what the plant can handle.
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