Actually distilled water has a low pH because of the atmospheric gases in it, so depending on temperature (temperature affects solubility of gases) at the time of bottling, how long it has been open, etc. you might get diff readings.
Anyway if you're using distilled water #1 step is calmag plus.
Then add nutes. Then test pH.
Most growers should be fine with their tap water BTW. Except for sulfur guy... you've got a problem
stinkyattic Reviewed by stinkyattic on . Distilled Water and PH??? I bought some walmart distilled water. The PH tests at about 5.5 I would guess from the chart. Should I use it like this or do I need to PH UP it??? Rating: 5