Soil pH & PPM / EC Slurry Test – Step by Step Guide with Photos

Knowing the pH of your growing medium is important from time to time. The soil pH slurry test is the easiest way of finding the true pH level of your soil based growing medium.

For this you’ll need:

Step 1: Collect a soil sample.

Soil in Cup

Step 2: Add distilled or RO water to your cup or container. Use a 1:1 or 1:2 ratio of soil to water.

RO Distilled Water

Step 3: Stir vigorously into a slurry. Stir for a few minutes.

Stir the Soil & Water

Step 4: Let it rest. Then stir again. Do this over the course of about 15-30 minutes. The longer the better.

Slurry Test

Step 5: Insert your pH meter into the slurry and read the results. You’re done. That’s the pH of your soil. You can also do this with your ppm / ec meter if you are interested in the conductivity value of your soil.

Take your Measurement

Tips & Tricks:

  • You can strain the slurry through a coffee filter to remove all the large particles from the fluid if you wish.
  • The longer you let the slurry mixture rest and re-stir the more accurate it will be. 30 minutes to conduct this test is recommended.
  • Reverse Osmosis or Distilled Water are necessary to conduct this test due to their ultra low ppm and neutral pH values.