Hello yes i do a final flush I always recommend it even though its been proven that if the bud is cured well its near enough impossible to tell the difference between flush and non flushed bud. I digress anyway there are many ways to flush depending on your system you have some maybe easier than others. I use the continious flush method in the first 3 days its alot of work but i think a thoughrough flush is good on the first few days i can usually get the ec down from 2.1 to around 0.8 in them 3 days then its just waiting for the plant to start eating itsself then I know shes gunna be well flushed :) best of luck buddy