Anyone thats says they dont flush because its in dirt / its organic etc etc is just crazy and lacks experience. They must like smoking left over nutrients. I have done many tests with the truncheon with some people claiming you dont need to flush and made them see chemicals pop up in that PPM run off test at the end of flowering FACTS!!! (They were amazed obviously
)
flush your product guys and dont be lazy!!! AND totally ignore anyone that tells you not too
.. If you still think you dont need to, then at the end, test ur runoff with ur truncheon and see that EC runoff nutrient leftover yourself ...