m0useanswered grow question 2y ago Flushing is a myth and does nothing to help the plant, flushing agents advertised for end of grow are more of a marketing tactic to make you buy more products and water alone will be just as effective.
If you feel it makes a difference keep using it the way you are, but you could have saved yourself some money in the end moving forward and just feeding some diluted sugar water.
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Best Of Luck!