Quote Originally Posted by Chabnoc
You are not using reverse Osmosis water, are you?
Yea, been using it since the begining. And yes, I use Cal-Mag+ as well.
Here's pics of the white widow, which looks the worst.
I tried flushing them a couple of weeks ago, because I thought there might be salts built up in the rockwool, but it didn't seem to help. This is weird, the pH usually goes up.

[attachment=o138295] [attachment=o138296] [attachment=o138297]
RedEye69 Reviewed by RedEye69 on . Please Help-pH in rockwool too low Growing in 6" rockwool, 6 weeks into flower in flood and drain. Every day I check pH in rockwool and it is around 5 (pH pen broke, so using drops). I up rez to about 6.5-7 to try and raise pH in rockwool each day. After flood rez is 6 and rockwool is 5.5-6, but the next day it's low in the rockwool again. Any ideas? TIA, RedEye Rating: 5