This is my first indoor soil grow. The ph is at 7.5. What is the easiest way to get my ph lower?

Thanks !!
Alvis11 Reviewed by Alvis11 on . My ph is at 7.5 What can I do? This is my first indoor soil grow. The ph is at 7.5. What is the easiest way to get my ph lower? Thanks !! Rating: 5