Using the correct pH in your nutrient solution is essential, too low or high and it could have a detrimental effect on your plants, so ideally the level should be between 5.8 – 6.2.
 
When mixing up nutrient solutions, pH can fluctuate, or the water being used has a naturally low pH, but with just a couple of drops of Growth Technology’s pH Up or Down, it can change the pH to a more acceptable level.