are you using cal mag + with your ro water?
advanced nutrients do a sensi cal mag grow and a cal mag bloom thats what i use.you will have to replenish the Micro nutrients that the ro sytem removes from the tap water ie, magnesium and calcium if you have been using just straight ro water this will be why you are having problems.be safe Dave
postmandave Reviewed by postmandave on . my tape wate has an ec 2.4 hi all and thnks growing in soil my tape water EC 2.4 that,s ppm 1200 @ x500 way high(im using CF ECO stick nutrient meter and it dose work)it,s my water. my ph is 8 and i bring it to 6,5 using ph down i used reverse osmosis machine to bring my tape water ppm down, but the plants don,t like it.(ppm from the r/o water is 00) leaves yellow and turn entirly yellow with brown spot nd tips burn i did use my tape water in the past with no much problem( apart that i coulid not feed them much Rating: 5