Looks like calcium and magnesium. What’s your water source? Are you supplying any calmag?
My water source is tap water. I use ph down to get it to 6.5ph. I do not use cal mag, I didn’t have this problem last grow ?? However I know things can change easily. Should I be using cal mag every time I give them water ??
do you know the ppm of your tap water going into the plant or coming out?
I use 5ml per gallon on water only days when I start seeing it. I don’t usually see it until they’re flowering.
My ppm is 16-17 from my tap
Oh thats low. I add 5ml of cal per gallon to mine and my RO with 3 stages takes down to around 10ppm. I am sure one of the more experienced growers will chime in but it looks like you may need to add cal to your waterings
Definitely should be adding calmag. Those are near RO water ppms.
Solid advice from BD.
How often, and how much cal-mag should I add? And any brands that you like the best ? Or is it all the same ??
Once a week, 5ml per gallon. I use botanicare cal mag but pretty sure it’s all the same.