Use Hydrotops Flush when your nutrient uptake has slowed, usually around two weeks from harvest at a rate of 5-10ml per litre. Hydrotops recommends flushing for a total of ten days, beginning with a 10ml application into your nutrient reservoir (switching out Hydrotops Bloom for Flush) for the first three days before reducing to 5ml per litre for the following three days. Four days before harvest use only plain tap water. By extending the flushing cycle in this way Hydrotops Flush will boost harvest quality and weight significantly.
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