PH testing

[smoked]

i have a ebb and flow setup and a 115 gallon reservoir but im not sure how much of the ph up and down to use. the ph is at 7.0 so i just poured in a small amount, can anyone let me know how much i should be adding.

[clever_intuition]

Use this chart to fix any ph problems. The instructions on the bottles should tell you how much to use to drop or raise a certain Ph level.

Thanks to Sticky for this chart!