PH PERFECT® MICRO Lush, Sturdy Growth From 3-Part Base Nutrients Designed Specifically For Your Plants Using a high-quality micronutrient formula is your ticket to a rewarding garden. By combining Advanced Nutrients pH Perfect® Micro with pH Perfect Grow and pH Perfect Bloom, you're providing your plants what they need to give you a happier harvest day. It's guaranteed! If you follow the label directions, pH Perfect® Micro will keep the pH of your nutrient solution stable within a range optimal for nutrient uptake for one week. For optimal results, we recommend using reverse osmosis (RO) water or water up to approximately 100 ppm (EC 160 ?S/cm). This product is specially designed for use with diverse hydroponic growing media, including peat, rockwool, and expanded clay pellets, and all continuous liquid-feed growing systems such as aeroponics, drip irrigation and emitters, NFT, flood and drain, and deep water culture. And since it also contains our proprietary pH Perfect® Technology, eliminating the need for pH and ppm metering, pH Perfect Micro is an invaluable asset to your growroom.