What is a Sewage Ejector Tank?

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Sewage Ejector Pump

A sewage ejector tank is part of a plumbing system that is more formally known as a sewage ejector tank and pump system or a pump-up ejector system. We install these systems when there are plumbing fixtures, such as a bathroom or laundry room, that sit below the main sewer drain or septic line.

Drain wastewater flow depends on gravity. When there are fixtures below the mainline, wastewater and sewage need to be lifted to this line to drain correctly.

These systems typically exist in homes or businesses with laundry facilities or bathrooms in the basement, particularly in rural locations where septic systems are more common.

How does a pump-up ejector system work?

The sewage ejector tank is installed below the ground, typically in a sump pump basin. The reservoir stores wastewater and solids until they are discharged, holding about 30 gallons for an average-sized home.

A float rests on the top of the stored waste, rising as the contents of the container increase. When it reaches a certain level, the discharge pump is triggered.

This pump sends waste fluid and solids out of the basin and up to the main sewage line, draining the tank. As the level of sewage lowers, so does the float. This decrease triggers the pump to turn off until the basin fills again.

A control valve prevents this waste from back flowing into the house line during this process. The sewage ejector tank has vents to avoid the build-up of sewer gasses and to maintain appropriate pressure before, during, and after the discharge process.

Some systems also include a grinder pump that comminutes solid waste. This means that any solids are ground and reduced to smaller particles before the pump ejects them into the main sewage line.

How do you clean a sewage ejector tank?

Regular maintenance on your pump-up ejector system will not only prevent unpleasant odors but will keep your plumbing running smoothly. Cleaning your ejector tank is easy and can help prevent more significant issues if done regularly.

All you’ll need is a water hose with a sprayer, gloves, bleach powder, and a scrubbing tool.

Follow these steps:

  1. Stop the water flow into the tank
  2. Open the cover and drain the tank with the manual control
  3. Shut off the electricity to the pump
  4. Remove loose waste with the hose
  5. Scoop out any gray or white floating grease masses
  6. Sprinkle your bleach powder over all surfaces and let sit for 20 minutes
  7. Scrub the tank
  8. Replace the cover and turn the power back on. Then flush your toilets to rinse

The more often you clean your tank and pump, the easier it becomes. We recommend doing this every six months.

If you have a sewage ejector system or septic tank, Ace provides septic tank pumping, cleaning, and maintenance services in the Tri-Cities area, including Pasco, Kennewick, Richland, and Benton City, among other locations. We began in 1973 and have been servicing septic systems since the 1990s. Schedule your maintenance today. Call us at (509) 546-0631 or make a service request through our website.