never use RO water, or distilled water ... I found that out, AFTER I spent a couple hundred bucks on my RO setup :wtf: ... RO and distilled water, remove all the minerals your plant needs ... especially magnesium, calcium, and iron, among others ... you can get by with adding Cal-Mag+, to your water, but if your tapwater, well, etc., isnt too bad, why spend money on Cal-Mag+ ? ... pH your water, and see ... I have no experience with E&F, but my drip systems were usually set for 15 minutes per daylight hour, and 15 minutes every two hours of darkness ... :smokin: