Cheers Hantshaze, thats handy to know, was just looking at the FaQ section and there's an interesting read saying that flushing can be harmful to roots and root hairs. Also that flushing with an addidtive will actually slow down and basically stop the plants from metabolising the remaining nutes.
I think it also says that water alone will mean that the plant is more likely to break down the remaining goodness it has left in the soil.Almost forcing acid and sugar breakdown, i think?
Here is a summary taken from the FaQ section.
" Preharvest flushing puts the plant(s) under serious stress. The plant has to deal with nutrient deficiencies in a very important part of its cycle. Strong changes in the amount of dissolved substances in the root-zone stress the roots, possibly to the point of direct physical damage to them. Many immobile elements are no more available for further metabolic processes. We are loosing the fan leaves and damage will show likely on new growth as well."
"The grower should react in an educated way to the plant needs. Excessive, deficient or unbalanced levels should be avoided regardless the nutrient source. Nutrient levels should be gradually adjusted to the lesser needs in later flowering. Stress factors should be limited as far as possible. If that is accomplished throughout the entire life cycle, there shouldn’t be any excessive nutrient compounds in the plants tissue. It doesn’t sound likely to the author that you can correct growing errors (significant lower mobile nutrient compound levels) with preharvest flushing."
I'm still a little confused though, but thanks Hantshaze for your input, so far I will take your advice as you mentioned that I'm not growing organically, that is a major factor.
Thanks for your advice on this
DG