I believe I am running the same system you are and all I ever use is the GH ph down. My water starts at 7.0 out of the tap and with nutes and all 27 gals water takes 35ml ph down for 5.8, not saying it would be the same for you since all water is a lil different :jointsmile:
tinytoon Reviewed by tinytoon on . P H DOWN I filled my res today to start my little ladies in the ebb n grow system. My ph is 7.04 I have already put in the nutes I'll be using and was wondering about this ph down. When I add it does it take long to take effect? I guess I'm saying how long should I wait to see if I have added the proper amount? I have the G H up and down liquid. I am using Ionic Hard water nutes at 1/2 strength. Any and all help on this would be great. Ive also heard that these nutes will drop P H after a day? any truth Rating: 5