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Final Flush A week before I harvest my medical marijuana I like to do a final flush. This flush is designed to rid the medium of excess salts, nutrients, heavy metals or any other toxins that have accumulated. There are many flushing agents available at your hydro store, but I like Final Phase by Advanced Nutrients. All plants respond differently to a pre-harvest flush, But i use only fresh reverse osmosis 0ppm water without ph adjusters.