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Question about flushing

TheBoogyman

Creme de la Creme Photos: Feb 2017
Hey guys. Just wondering how I should go about flushing my plants. I do have a blossom builder from bcuzz products and I'm curious if I should flush this out at the end or not. I assume I am supposed to. Also, what should the ppM be when flushing? My waters normal ppM? Thanks guys.
 
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