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I have a pc grow box with the whole set-up I bought some fox farm Grow Big for Veg part guy who sold it to me said the pH will drop to gowth rate once nut is added but I'm wondering should I buy the pH meter and the ppm meter to follow the Fox Farm feeding schedule.

I'm starting my first Hydro grow but i need some help! I'm using bottle water for my hydro grow,the guy at the gardening center said I don't need a pH meter for a water hydro grow because bottled water pH is neutral. Is that true or should I buy a pH and PPM meter?