How To Install A Replacement Baffle In Your Septic Tank

Posted on: 8 December 2015

A baffle is used to keep solids from flowing into your outlet pipe in your septic tank and clogging up the pipe and leach field. Baffles are typically made out of concrete. They are placed in front of the outlet pipe in the tank so solids can't directly flow into it. As the tank fills with water, the solids sink and the water spills over the baffle and into the outlet pipe. If the baffle deteriorates and breaks, it will have to be replaced to keep your septic system functioning as originally designed. Here is how you can replace a concrete baffle with PVC pipe.

You Will Need:

  • PVC Piping
  • PVC Sanitary Tee
  • Tapered PVC Fitting
  • PVC Cement
  • Hammer
  • Hacksaw
  • Measuring Tape
  • Baffle Filter

Step 1: Remove Waste

You should have the septic tank completely pumped out before you replace the baffle. Removing the waste will make it easier to work and prevent you from being exposed to a high level of sanitary waste.

Step 2: Remove Old Baffle

You need to remove whatever is left of the old baffle before you install a replacement one made out of PVC pipe. Take a hammer and break the rest of the concrete barrier. Make sure you pick up all the broken pieces of concrete that fall to the bottom of the tank.

Step 3: Measure the Length of the Baffle

Measure the distance from the bottom lip of the outlet pipe to the floor of the tank. You want the bottom of the baffle to be an inch or two above the floor once it is installed.

Step 4: Construct New Baffle

You should put the baffle together before you install it in the tank. Cut the length of pipe you need and attach it to the bottom of the sanitary tee with PVC cement.

Place a liberal amount of cement on the end of the pipe going into the bottom of the tee. Then place cement inside the tee where the pipe is placed. Connect the two pieces together quickly, as the cement dries very fast.

Take a small length of PVC pipe and cement it to the stem of the sanitary tee. 

Step 5: Install Tapered Fitting on to Outlet Pipe

The tapered end of the fitting slides into the outlet pipe. This will be a tight fit and you might have to use a hammer to tap it into place.

Step 6: Install New Baffle

Cover the inside of the open end of the tapered fitting with cement, and do the same with the outside of the small piece of pipe that is placed into the fitting. Slide the small piece of the baffle into the fitting with the long end of the pipe facing toward the floor of the tank.

Insert the baffle filter into the open end of the tee facing upward. The filter will stop larger pieces of solids of entering the outlet pipe and plugging it up. Put the cover back on the septic tank.

For more help with your septic tank, visit a service like SOS Septic Inc.