I grew in soil for a year and never used a ph meter and my plants produced 24 ounces per 1000 watt light with just nutes and tap water no ph up or down
Hey, Spidey! What's the PH reading on your tab water?
My tab water is about 9.5 always so I have to adjust ph.
-----------
Ok.. you don't have a ph meter.. Maybe your tab water is between 6.5 ~ 7.0..