How to Put a Bathroom Stool Below Septic Tank Level

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A standard toilet operates by gravity. The drains continually run downhill until they reach a waste water treatment facility or a pumping station. Any toilet installed below the level of the septic tank inlet will obviously not operate in this manner. For these special applications, you will need to install an upflush toilet.

Things You'll Need

  • Upflush toilet
  • Drain pipe
  • Water line
  • GFCI Outlet
  • Electrical wiring
  • Locate an existing drain line near the planned toilet installation point. The closer to the toilet the existing drain line is, the better. Since a pump will be used to move the waste water from the toilet to the drain line, the shorter the distance is, the less strain on the pump. This will also help prevent potential clogs should the load be more than the pump is capable of carrying over long distances.

  • Install the drain and fresh water supply lines. Tap into an existing cold water supply line using a 'T' joint to bring the water supply to the toilet. While distance is not a factor in smooth operation here, the shorter the distance traveled the fewer materials you will be required to use, thus lowering your cost slightly. Depending on the code in your area, this pipe can be either copper or PVC. If code allows PVC, you will find it much easier to work with if you are not experienced in working with copper piping.

  • Run an electrical supply line to the toilet area. Depending on the model you have purchased, the toilet will either plug into an outlet or will be hardwired inside the unit. If an outlet is required, it must be a GFCI (ground fault circuit interruption) device in order to meet code and provide your family the maximum amount of protection. Be certain all power to the area is turned off before beginning any electrical work.

  • Install the upflush toilet. The toilet will contain a water storage tank as well as a pumping unit. The drain will include a back-flow check valve to protect the pump from any residual waste in the drain lines. Connect the drain line and water supply line, then plug in the toilet. The toilet should now be ready to use.

Tips & Warnings

  • Purchase an upflush toilet with inlet values for a sink and tub. Should you ever wish to install a tub, sink or spa, you will not need an additional pumping station.
  • Double check to be certain all electrical power is off before beginning any electrical installation/repairs.

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