6.7-6.9 is optimal

if your soil ph is correct and water is not i would suggest getting liquid ph up and down and put in your water before you feed. go with a general hydroponics uses ph up This Base solution is formulated using Potassium Hydroxide and Potassium Carbonate
ph down Phosphoric acid. those products are a better choice for the plants
texas grass Reviewed by texas grass on . up and down What would you guys recommend for PH adjustment. Should PH up or down be added to the water before feeding. I am using a soil based grow. Does HTG have good PH adjustors or should this be done with nutes. Not sure that is why I am asking. What would you all recommend? Rating: 5