illegal smile is correct, ro water is best for flushing. 0 background EC. by adjusting ph you are adding more chemicals, which at flush time, is not what's needed :)
smokey
hi chief, don't know much about your nutes ? but, if there is a mix of chemical and organic nutes in the res this could be the cause. the two don't mix well and will give you foaming, and a rank smell. this could eventually rot your roots. are you currently using all those nutes at the same...