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Number of Days to Flush Nutrients

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What is the minimum amount of time to flush the nutrients in an aeroponic environment?  I've heard as long as two weeks.  That would seem about right for a soil grow; but, thought you could purge a soilless environment more quickly. 

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I've grown a lot of DWC and never flush.  I just reduce the ppm to about 300 for the last week before starting to crop beginning with the large colas then letting the ones below that ripen up for 10 days or so before chopping the rest.  Very slow dry of up to 5 weeks before putting in jars for burping another month.  Burns clean, smokes smooth.  Dry too fast and it tastes like crap and harshes your throat.



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