flushing simple. every fall right before winter what happens? exactly leaves turn yellow and orange and eventullay fall off and die end of season! well it isually rains forever in the fall aswell so thats natures flush. now back at home if you ppm your grow its super easy at the beggining of wk 7 say your last ppm reading was 1000 and your feed water is like mine 90ppm well at the end of week 8 you should be around 100ppm of your run off! now folk swear by flushing agents. lmao have you read one thats non toxic? well the shit disolves npk from your media so do you really think its healthy to smoke ? really water water water fucking water is all you need. and organic folks who say say its organic no need to flush, bullshitunless your 100% veganic dead animal byproducts cant be good lol butif you re-read the top nature flushes why shouldnt you?