Wisher619 said:

it acts as a chelator for built up salts to grab hold of and fush out of the medium
for this particular flushing agent
you run this through your medium until 80-90% runoff occurs....you then follow with pure h20 for the rest of the cycle
it is not intended as some type of prolonged cycle
it is merely used to break down and grab hold of the rest of the nutrient bank and release it from the medium so that when you run the h2o through it clears the medium of all salts

for hydro application you use it for 2 hours then dump your res and refill with pure water and run
changing out periodically until you reach an acceptable ec value of your desire

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