GH ph up and down take effect instantaneously.
Depending on fertilizer, water and medium it can drop or raise.
If you would like to learn more about pH management read the link in my sig.
demoreal Reviewed by demoreal 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