If you're using RO water you must replace the calcium lost from filtering. Use calmag + with your RO water. Your nutrients have trace elements in it as well (the micro), however, they do not contain all the goodies that the plants need.

If I worked at the store that sells R/O systems, I'd have a bunch of calmag+ on hand to sell with the filters.

GM
GluteusMaximus Reviewed by GluteusMaximus on . CalMag with GH 3 part nutes The setup: Basically a bubbler / drip hybrid, my roots dangle into the reservoir which has an airstone. The grow is going great, we're in week 6.5 and my leaves have just started spotting (began last week and I understand this is normal), buds are shaping up nicely. I'm still giving full strength nutes with RO'd water and will begin a pH'd flush next week. I've never noticed anything that looks like trace mineral deficiency; the leaves have always been an even green tone... so are trace Rating: 5