I did a test run yesterday with measuring out my nutrients. I added 1.75 ml of the "powder" grow terra to 1 gallon of water and checked my PH after. The PPM of my water was around 100 PPM (it fluctuates). With the addition of nutrients the PPM went up to 375 PPM, which was right around the area I was shooting for; 275 PPM of nutrients and and 100 PPM from the water.