How to Remove Grease From a Septic Tank

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Cleaning grease from a septic tank is important to maintain its proper functioning. Here are some steps to clean grease from a septic tank:

1. Remove the solid waste: Use a septic tank pump to remove the solid waste from the tank. This will prevent clogs and allow the cleaning process to be more effective.

2. Add a degreaser: Pour a septic tank degreaser into the tank. This will help break down the grease and make it easier to remove.

3. Use hot water: Flush hot water into the tank to help further break down the grease.

4. Scrub the tank: Use a long-handled brush to scrub the walls and bottom of the tank, focusing on areas with grease buildup.

5. Rinse the tank: Use the septic tank pump to rinse the tank with clean water, removing any remaining grease and debris.

6. Regular maintenance: To prevent future grease buildup, avoid pouring cooking oil, fats, and grease down the drain. Instead, dispose of them in a separate container and dispose of it properly.

Remember, regular maintenance and cleaning are essential to keep your septic tank in good condition and avoid costly repairs.


Septic tanks are an important part of your property and home. It is crucial to take care of and maintain the tank and plumbing lines in order to have a well-functioning septic system. The accumulation of fat, oil, and grease, also known as FOG, can greatly impact the performance of your septic tank and eventually prevent it from properly decomposing waste.

Grease Accumulation in a Septic Tank

The main reason for FOG buildup in a septic tank is the habit of disposing of cooking oil or grease through the plumbing drain system in your home. It may seem like the easiest way to get rid of your cooking waste, but what you may not realize is that once it settles in your septic tank, it solidifies and forms a barrier on top of the waste. Having a layer of FOG in your septic tank is normal and is referred to as the scum layer, which contains fats and oils. However, there are measures you can take to ensure it doesn’t become a problem.

The scum layer only becomes an issue when it becomes so thick that it hinders the functioning of the septic system. Beneath the scum layer is a liquid layer of decomposed waste, and at the bottom of the septic tank is the undecomposed waste. When the scum layer becomes too thick, it pushes down on the liquid waste layer where the exit drains are located. If the scum layer is still somewhat liquid, it can flow through the exit drains into the leach field, where it clogs the drainage pipe and can ultimately lead to system failure.

Removing FOG From a Septic Tank

The best way to keep your tank in optimal condition is to have it regularly pumped by a septic removal company. They will remove all the waste and scum buildup, leaving you with a fresh and clean tank. If you wait too long to have the tank emptied and the FOG enters the leach field, you may need to have your entire sewage system excavated to replace clogged pipes.

If you want to break down any oil and grease accumulation, do not use harsh chemicals that promise to break down scum in your toilet or drain. While they may fulfill their promise and break down the scum, they will also eliminate essential bacteria that help your septic tank function properly. Opting for chemical additives may solve the immediate problem but can create bigger problems in the long run. Some harsh chemicals can sterilize your septic system, which unclogs the pipes where grease has built up, but this can result in raw sewage entering your leach field.

Proper Disposal of FOG

The most effective way to prevent FOG buildup in your septic tank is to properly dispose of any cooking oil or grease instead of pouring it down the drain. You can collect the cooking liquid in a sealable container, such as a plastic bottle with a cap. Once the bottle is full, you can dispose of it in your waste bin.

Alternative options for disposing of used cooking oil

If you are wondering how to properly dispose of used cooking oil and grease, there are several options available to you. One possibility is to search for a drop-off recycling center that accepts these materials. Additionally, you may consider donating your used oil to a biofuel company that is willing to accept it as a donation. This way, you can contribute to the production of renewable energy.

However, if your cooking primarily involves plant-based foods, you have another option. You can choose to dispose of the oil in your own compost pile. This way, you can recycle the oil and benefit your garden at the same time.

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