Always add the nutrients to the water before checking and adjusting the pH of your solution. The nutrients will usually lower the pH of the water due to their chemical make-up. After adding the nutrients and mixing the solution, check the pH using whichever method you prefer and decide whether you need a product to raise or lower the pH. Add small amounts of pH adjuster. Stir very well and check the pH again. Repeat the above steps until the pH reaches the desired level.