When you use all the basic nutritional nutrients, PH Perfect automatically stabilizes the pH in the optimal range of 5.5-6.3 and keeps it there for a week. Only experienced growers should sign up to unlock the full genetic potential of their plants with PH Perfect Connoisseur Grow A+B. The most powerful ingredients ensure the most productive growth phase. PH Perfect technology automatically keeps the pH constant every week. Prepare for your biggest and most difficult plants!