Cyco pH Up – raises the total pH value of the made nutrient solution Directions: Use sparingly – add drops to nutrient solution a little at a time, continue to test pH levels. Repeat application until desired pH level is achieved. The quantity required for pH adjustment will vary depending on the nutrient strength and the purity of your water. This product raises nutrient pH. Recommended pH for most plants is 5.5 to 6.5.