Not many people on these forums grow in coco, so it might take a few days for you to get a reply. I use Canna Coco in pots, I know I should, but I have never bothered to read my outgoing TDS. I am going to be feeding in a few hours so I will take a TDS reading from the runoff and see what results I get.

Quote Originally Posted by demoreal
does coco have a bunch of salt in it?
are you supposed to give it a good pre flush?
Coco has some salt in it, but it is supposed to be removed during the manufacturing process. There is no need to flush it before use, but I would suggest going with a tried and trusted brand.
PhatJay Reviewed by PhatJay on . Bizarre runoff in coco...?? I use a 50/50 mix of Roots Organic coir and hydroton. I just tested the runoff and I'm getting 6.5 pH and 1500+ ppm. I feed every morning with AN 3 part & CalMag. pH @ 5.6, 900 ppm. What is causing the intense runoff? Rating: 5