stvitusdance
Well-Known Member
I don't know if I mentioned this or not. I've been doing some forum reading and it seems to be a common problem when using RO water to not have enough cal/mag. I'm pretty sure that might be the early yellowing I've noticed this grow. One guy suggested mixing 1/4 tap water back in to one gallon RO water. Others suggested using a calmag supplement. I got a cheap TDS meter and sure enough my RO water was like 002 and my tap water was around 150 ppm tds. It's too late for this grow but next time around I'll be supplementing my RO water. Good to know!