I haven't got factual evidence but my mate who grows in nft never full empties the res, just tops up once a week or when needed and grows some lovely smoke .
I always changed once a week, fully emptied and made a fresh solution up. The plant is growing every hour/day/week so the nutes that are needed need to be changed as the plant changes and grows.
I haven't grown in rdwc so it maybe different ✌
"To live is to risk it all. Otherwise you're just an inert chunk of randomly assembled molecules drifting wherever the universe blows you."
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