i'm not saying that there are chemicals, I'm saying that if you grew lettuce and used shit as fertilizer you would sure want to make sure it was clean of shit before you ate it woudnt you?
Nongreen, I think you're looking at things a little too simplistically.
When you feed plants grown organically with organic nutrients whether it be cow manure, chicken manure or any other organic compound you need to understand the changes that those organic compounds go through in the transformation from their 'solid organic form' to available nutrients ready for uptake by the plants roots. In the soil around the root zone are thousands of micro-organisms, microbes and friendly bacteria generally referred to as the 'micro herd' that actively feed on these 'organic compounds' and turn them into the readily available chelated macro and micro nutrients that the plant uptakes via it's root zone.
It's no different to the way worms create worm humus by feeding on old food scraps and rotting vegetation and produce humus high in Nitrogen content.
Personally, I'd rather smoke something grown naturally and organically than something pumped full of man made minerals and chemicals - but that's a personal choice, as is flushing.
Biobizz grow contains a high percentage of sugar beet by products - not too dissimilar to the highly rated bootstrap molasses that everyone raves about. It contains high percentages of sugar and carbohydrates that helps to make the buds a sweeter smoke - which is why I increase the Biobizz grow towards the end of harvest and decrease bloom - why would I want to flush that out?
Flushing is a subject that attracts much debate - mostly because people don't fully understand the reasons for doing so - and don't fully appreciate that there's no one solution for everyone - because everyones grow is different, some need to flush and others don't.
If you've fed your plant with organic nutrients at a level that replenished spent nutrients at just the right time and gently tapered down your nutrient feeds towards harvest so the plant uptakes and uses all the available nutrients so none are left - why would you need to flush?
If you've fed your plant nutrients at increased levels so the plant cannot use all the available nutrients and so theres residual nutrients left over near harvest than it would be sensible to flush.
As you can see, everyone's feeding is different, everyones assessment of how much nutrients their plant needs is different - hence some need to flush and others don't.
It's in the skill of the grower and not any blanket recommendation of whether to flush or not.