Originally Posted by
greengiant
It sounds like your plants are struggling dude.
In dwc you should always have calmag present in the water. My background ec is 0.35 so I haven't used it up to week one of flower but if my plants tell me to I will.
You're on ro water so I would suggest adding calmag to increase the ec to around 0.4 and then add nutes up to 1.0
4.9 is a really low ph. It's well over ten times more acidic than it should be which won't help with calmag uptake at all.
I would look at getting my ph in order before worrying about deficiencies as that will cause you a while world of feeding problems.
Try making a feed up with 0.3 calmag and the rest normal feed up to 1.0 ec and see what happens.
Ph usually drifts up in my little dwc experience so it's a strange one to me.
Hopefully a more knowledgeable dwc grower can help further but for now make up a feed with calmag up to 1.0 and ph of 5.8-6 and that should help.
What size is your system? Ie litres of water to each pot and how big are the plants?
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