Flushing/Clearing agents are designed to bind to excess mineral salts that have built up in the root zone so they can be "flushed out" with your runoff, reducing buildup and potential for "burning" in your plants. These are typically used by growers at the end of a grow cycle who want to remove excess salt buildup from the root zone, or growers who need to clear out a build-up of salts at some point in the grow cycle that's having a negative effect. Some of these products like H2O2 are antibacterial instead, designed to kill the bacteria that produce biofilm (slime) and contribute to root rot for grower's that want to maintain a sterile environment.
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