When you use any Advanced Nutrient’s base nutrient, the pH Perfect® Technology inside automatically stabilizes and locks in your pH within the optimal range (called the ‘sweet spot’) of pH 5.5–6.3 – and keeps it there for one week. No more pens. No more meters. No more being chained to your nutrient reservoir, checking and adjusting pH, the scientific formulation does it for you. Just use any pH Perfect base nutrient as directed on the label and let the cutting-edge science balance the pH for you. And we stand behind this promise to you with our world famous Grower Guarantee(see bottom of the page) – we guarantee it because it works. It’s that simple.