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 ‚âà√≠‚à´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.