Peerless Atlas Scientific Calibration Solutions Adjustment Combo Set, Feature These hydroponic solutions are manufactured under strict conditions to insure quality and stability, The bottles are packaged in an additional plastic bag to ensure against leakage or damage, Atlas Scientific pH Up and pH Down are designed to be used specifically for hydroponic growing systems, Use this product sparingly, Add a small amount of Atlas Scientific pH Up or pH Down to your hydroponic growing system, Reevaluate pH and add more as needed.