Add Hydroguard during Flush?
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No. Flush is meant to use up all chemicals and nutrients in the plant.
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What Todd said. You are over the root rot hump. Nothing but distilled or RO water, pH, and a finisher if you have it (I.e. Flawless Finish). I would completely remove and cap bottles 3, 4, & 5 as a simple precaution.
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