How to Guide: How to Measure Run Off

Measuring Runoff

Measuring runoff can tell you a lot about a plants state of health, anything from feeding issues to root issues. It is best practice to use a clean container as well as a properly calibrated EC and pH meter, this way you can get the most accurate reading possible.

Knowing the pH (potential Hydrogen) and EC (electrical conductivity) levels will give you an insight into the health of the root zone and will show you if your plant is absorbing nutrients or if there is an underlying issue like root rot or high levels of salt. 

A pH closer to 1 indicates high levels of acidity and a pH of 14 indicates an alkaline environment. Generally a more acidic environment is from overfeeding causing salt levels to build up. This can also occur when there is a not enough run off in drain to waste systems.

('Nutrient lockout' is when your plants can no longer absorb nutrients properly because they are unavailable to the plant)

What to look for:

The pH of your runoff should be between 6.2 - 7.2 for soil or 5.8 - 6.5 for hydroponic and soilless mediums

The runoff EC should be slightly higher than your input EC depending on the stage of growth. If you have major differences between inputs and run off then there is a problem that you need to address

How to test:

Step 1: Measure your base liquid, It is a good idea to know your starting values are

Step 2: Start by watering your plants with your solution (or with regular water), water until roughly 15-20% of the water/solution runs out of the bottom of your container

Step 3: Collect a sample in a clean container

Step 4: Use your Instrument to test the pH and EC of your runoff

Its that simple

Watch the youtube video here!