I use RO water with other nutrients sometimes I would follow your feeding table for the flush most just advise ph balanaced tap water though common sense tells you that ro water would be better I use it lol Flushing means starving her of nutrients so she uses her own and not adding more chemicals flushing agents ect and alot of people will disagree with me but I never have used them and working for a nutrient company myself we dont advise using flushing agents some can ruin bud if they arnt balanaced right ect.