How to Make Septic Tank Activator

Updated February 21, 2017

Septic tanks need consistent care to keep them active and healthy. Although commercial septic tank activator can be purchased at the store, it's simple and inexpensive to make a homemade septic tank activator. The activator, which is made up of yeast, brown sugar and water, keeps the bacteria in the tank working to eliminate the waste.

Pour two pouches of active dry yeast and a pound of brown sugar into a large mixing bowl. Use a potato masher to gently break up lumps and mix the two ingredients.

Pour 4 cups of warm water into the mixing bowl and stir the mixture with a wooden spoon until the sugar has completely dissolved.

Place the bowl in a warm place and let it sit for about 20 minutes. The mixture will become foamy and expand, so make sure it has ample room in the bowl.

Pour the septic tank activator into the toilet and flush.

Repeat treatment every three to six months, or more frequently if experiencing some blockages.


This treatment will not unblock a septic tank. If the septic tank is completely backed up, call a professional. Never use this activator in a toilet that is not hooked up to septic system.

Things You'll Need

  • 2 pouches of active dry yeast
  • 1 pound of brown sugar
  • Large bowl
  • Potato masher
  • 4 cups of warm water
  • Wooden spoon
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