How to Change a Hydroponic Solution


Hydroponic nutrient solution is the most important component of a hydroponic system for making plants grow. Nutrient solution contains all the food your plants need in the absence of soil. When a nutrient solution is mixed properly, little must be done to keep the plants healthy. Over time, the nutrients and water in the solution get used up by the plants, meaning there are not enough nutrients to make the plant grow, or the nutrients are concentrated in the remaining bath. Knowing how and when to change your solution is essential to healthy plants.

Step 1

Add nutrient solution to your water according to the instructions on the nutrient solution bottle.

Step 2

Stir the nutrient solution into the water, making sure it is mixed thoroughly.

Step 3

Measure the total dissolved salts (TDS) and the electrical conductivity (EC) of your nutrient solution, using your TDS/EC meter. This will measure the exact amount of nutrients in the water, and whether it is correct for your plant.

Step 4

Test your nutrient solution, using a pH/ED/TDS meter. The pH must be between 5.8 and 6.8.

Step 5

Cover the nutrient solution so that light does not get into it. This will keep the water from evaporating quickly.

Things You'll Need

  • PH tester
  • Nutrient solution
  • Water
  • PH/EC/TDS meter
  • PH up and down solution


  • University of California Berkeley: The Water-Culture Method for Growing Plants without Soil
  • Guide to Organic Hydroponics: How to Use Hydroponic Nutrients with Sucess
  • Octiva: EC/TDS/ PPM meter
Keywords: hydroponic solution, how to change hydroponic solution, maintaining hydroponics

About this Author

Cleveland Van Cecil is a freelancer writer specializing in technology. He has been a freelance writer for three years and has published extensively on, writing articles on subjects as diverse as boat motors and hydroponic gardening. Van Cecil has a Bachelor of Arts in liberal arts from Baldwin-Wallace College.