mate anything above 6.3 to 7 is fine for coco . i use nothing but cocofibre and have been for a number of years now . it is by fair the most stable medium i have used.

heres a few of my results using coco
http://boards.cannabis.com/indoor-gr...vest-pics.html
Shallow Hal Reviewed by Shallow Hal on . Question: pH & coco coir I'm going to do a grow in coco coir and I was getting ready to flush the coir and get it pH'd properly. I intended to use pH7.0 water, but some of the things I have read here today are saying the pH for the coir should be 5.7. Can someone who has grown in coir please tell me what the proper pH should be? Thank you!!!! Rating: 5