Garbage Disposal for Septic Systems

11 June 2019 Shares

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By 11 June 2019 Shares

Garbage Disposal for Septic Systems

Food waste disposal for septic systems or septic tanks

Can you use a garbage disposal if you have a septic system instead of the regular sewer system? A septic tank is watertight tank that stores domestic sanitary wastewater underground and is most commonly used in areas where there are no connected sewerage systems. If your waste water is stored in a septic tank it isn’t recommended to use a garbage disposal unit. Why is that?


septic tank breaks down matter by bacteria. But these bacteria can’t break down solids properly, and food waste is solid waste and if you grind up your food scraps in the garbage disposal you flush the particles into your septic system. These food scraps will form a sludge inside the septic tank which grows in volume because the bacteria can’t break down the solid food waste quickly enough. This means that the rate of accumulation of the sludge is much quicker than the rate of decomposition. Besides, some types of food waste can’t be digested at all, such as coffee grounds, fruit pits, meat bones and fats.

A septic tank isn’t meant for breaking down solid food waste.

Wastewater that is flushed down the drain ends up in the drainfield of the septic system. There the water will be filtered down by the soil and flow towards the groundwater. The use of a garbage disposal unit can hurt the functionality of the septic system, because food scraps can accumulate in the outlets of the drain field. This will stop the drainage of the wastewater towards the groundwater. The whole benefit and functionality of a garbage disposal dissolves because the septic tank is turning in to a food scrap bin, but a very expensive one which.

Conventional septic system | Source:

The food sludge in the septic tank takes up valuable space which normally is meant for waste water. In other words, it reduces the tank’s capacity and efficiency. But it also reduces the bacteria inside the tank which are needed to break down the particles from the waste water. Ultimately, letting a garbage disposal drain into a septic tank will overwhelm the bacteria and with that disrupt the equilibrium in the tank, decreasing or shutting down the effectiveness of the entire tank.

Septic garbage disposals

InSinkErator Evolution Septic Assist

If you want to use a garbage disposal in combination with a septic system it is recommended to purchase a specially designed food waste disposal. The difference between this and a regular disposer is that a septic garbage disposal breaks down food waste while released special enzymes. These enzymes helps breaking down solid food waste inside the septic tank more quickly.

Does this mean that you can use your garbage disposal just like any other disposal unit, which is connected to a shared sewer system? Unfortunately, not. You always need to be extra careful when disposing food scraps in the garbage disposal if you have a septic tank. This is because you can only dispose food waste which really can be broken down well. This means you need to stay away from discarding things like coffee grounds, fruit pits, meat bones, oil and grease to prevent needing extra maintenance and repairs for your septic system. You can also never dispose objects that aren’t biodegradable at all, like food packaging. But this is applicable to every garbage disposal.

Read more information about food waste disposers here.

Recommended garbage disposal for septic systems

InSinkErator Evolution Septic Assist

Best garbage disposal for septic systems


The InSinkErator Evolution Septic Assist is a garbage disposal that is optimized for homes with septic systems. This disposer adds an automatic injection of enzyme-producing microorganisms to the food waste that helps break down the food particles much quicker in your septic tank. This InSinkErator is quiet and powerful thanks to the 3/4 HP motor.

Tip: Order extra Bio-Charge Cartridge replacements here.

  • Feed type: Continuous feed
  • Horse power: 3/4 HP
  • Speed: 1725 RPM
  • Weight: 22.6 pounds
  • Warranty: 4-year

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Video about the InSinkErator Evolution Septic Assist

2 Comments on “Garbage Disposal for Septic Systems

  1. Dear All,
    Interested area we would like to introduced to Sri Lanka to your solution. specially for domestic houses /Farm .Please send us details and rates.

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