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I read about the need to flush one's system weekly
No not a need mate but some folk do flush every week.I myself dont think its necessary unless you have a prob.Its horses for courses

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Some people use cannazym, h2o2 and other potions to dissolve roots, kill algae and keep the solution clean.
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Flushing simply starts again with fresh nutes.
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I am a soil grower,
When folk do flush its with plain water for 24 hrs,then they add a fresh batch of nutes
But my thinking is why starve the plant for 24hrs
Owd