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PH Down by Advanced Nutrients Specific for Hydroponics 500 mL liquid pH-Down The acidity or alkalinity of your crop's water and root zone is important, and can be measured by pH. I f the pH is too high or low, your plants may not be able to absorb nutrients and could be harmed or die. To prevent this, smart growers check and adjust the pH levels daily for different types of plant growth media. Advanced Nutrients makes high-quality pH products that are made from pure, pharmaceutical-grade ingredients like Potassium Hydroxide. It's important not to store pH Up and pH Down products together. Show more