Your TDS seems high.
What kind of meter do you have?
is it the .5 or .7 conversion?
my ppm during week 6 of flower is around 850ppm on a .5 conversion.
that is 1190 on a .7 conversion.

I have never even gone to 1600.
You might take into consideration once again that your TDS is too high. Get another opinion though.
demoreal Reviewed by demoreal on . Another possible Phosphorus deficiency? Hi all, hope you can help. I've read and read for a week till my head hurts and I think I have a good idea what the problem is, but not positive so thought I'd get your thoughts. My leaves start turning brown at around week 7 and continue to get worse till week 12 when some are totally brown and burnt looking. I thought it might be nute burn so lowered the nutes for a few weeks but that didn't help. I now feel it is a Phosphorous defiency so I've upped the nutes and added additional Cha Rating: 5