its litmus paper if that is how you spell it. Alot of nutes lower your ph drastically however I have never tested that brand. R.O. water should be right around 7.

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karmaxul Reviewed by karmaxul on . growing hydro with no way of checking ph i know i should have waited to get the ph pen but i couldnt. i know that ph should be aroung 5.5 -6.0 in hydro. everything is looking good but im kinda nervous cuz i dont want to lose my babies.i heard that ro water is 6.0 then when you add the gh 3 part form.the ph will drop to around 5.8.is this true. Rating: 5