Garbage Disposal for Septic Systems

5 November 2019 Shares

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By 5 November 2019 Shares

Garbage Disposal for Septic Systems

This page is part of the Garbage Disposal Guide.

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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 a watertight tank that stores domestic sanitary wastewater underground and gets commonly used in areas with no connected sewerage systems. If your wastewater is being stored in a septic tank, then we don’t recommend using a garbage disposal unit. Why is that?

reuse-reduce-recycle-iconA septic tank isn’t meant for breaking down solid food

Recommended disposal for septic systems

When you buy garbage disposal for a home with a septic tank, you can’t just buy any disposal. You need to purchase one with a septic assist, which will keep your septic tank healthy with additional enzyme treatment. This enzyme treatment comes within a cartridge that can be attached to the septic assist garbage disposal, and just like with a printer, this cartridge needs to be replaced ever so often.

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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InSinkErator Septic Assist Bio Charge Cartridge

Enzyme replacement cartridge for septic disposal.

  • The bio-charge enzyme treatment is citrus-scented
  • Cartridge lasts 3 to 4 months with average use (4x longer than other treatments)
  • The cartridge bottle holds 16oz. of treatment fluid
  • You can also buy them in packs of 2 or 4 cartridges

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How do septic tanks work?

A 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, such as coffee grounds, fruit pits, meat bones, and fats.


Wastewater that gets flushed down the drain ends up in the drain field 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 septic system’s functionality 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 garbage disposal dissolve because the septic tank is turning into a food scrap bin, but a costly one.

Conventional septic system | Source:

The food sludge in the septic tank takes up valuable space, which is normally meant for wastewater. In other words, it reduces the tank’s capacity and efficiency. But it also reduces the bacteria inside the tank, breaking down the particles from the wastewater. Ultimately, letting garbage disposal drain into a septic tank will overwhelm the bacteria, disrupt the tank’s equilibrium, decrease or shut down the entire tank’s effectiveness.

Septic garbage disposals

InSinkErator Evolution Septic Assist

If you want to use a garbage disposal combined with a septic system, we recommend purchasing 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 help with 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 connected to a shared sewer system? Unfortunately, not. You always need to be extra careful when disposing of food scraps in the garbage disposal if you have a septic tank. This is because you can only dispose of food waste, which really can be broken down well. This means you need to avoid 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 of objects that aren’t biodegradable at all, like food packaging. But this applies to every garbage disposal.

Read more information about food waste disposers here.

Video about the InSinkErator Evolution Septic Assist on Youtube

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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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