Frequently Asked Questions

Here are answers to some of the questions people have asked us over the years.

Where can I install my Aquatron Separator and Bio Chamber
  1. In a basement.
  2. In a crawl space.
  3. In a separate shed.
  4. Outside.

If the installation site is located below the level of the grey water sewer, the pump may need to be installed in order to pump the fluid to the grey water outlet.

The pipe length can be as long as you need as long as you stick to the standard of a 75mm gradient per metre. Existing Enviro Composting Toilet systems have reached up to 65m. Keep in mind that the more connectors you make along the pipe the more chance of build up occurring.

What is a “soakage field”? (Also called a "leach" field)

A soakage field allows the treated fluids to be soaked into the ground, where further treatment occurs.

For more information see:

Where can I get more worms?
We can supply you with a generous population (approx. 500 grams of worms) contained in a 4 litre bucket shipped directly to you:
$55 delivered anywhere in the North Island 
$65 delivered anywhere in the South Island

Tips for both the Aquatron and Farmstyle composting toilet systems

Important things to keep in mind when you own a composting toilet


Use the right worms

Tiger Worms

  • The best worms for composting toilets are Tiger worms (Eisenia Foetida)
  • Worms can ship them to you anywhere in New Zealand.
    • $55 delivered anywhere in the North Island
    • $65 delivered anywhere in the North Island
  • Worms should be placed in the main Bio Chamber composting chamber within two weeks of the toilet being used.
Check for insects

In the early stage of the composting cycle, tiles (similar to fruit flies) may be found in the composting chamber. This is very unlikely, but there can be sometimes be a small amount of spore in the peat moss. If this occurs, it can be rectified easily with organic insecticide or add some untreated fresh sawdust.

Use common sense
  • Use a small handful of garden lime every 2 months to help maintain aerobic conditions.


Add kitchen waste

If kitchen garbage (waste) is deposited into the Bio Chamber it will attract flies, as vegetable matter has fruit fly spores (in most cases) on it and they could hatch and flourish in the composting process.

Add inorganic materials

DO NOT put such materials as glass, metals and plastic into the compost chamber.

They will not damage the process but could be hard to retrieve from the compost and could prevent the composting material from moving down the air staircase as it is being processed.

Add sanitary towels or nappies

DO NOT put nappies or sanitary towels into the composting chamber.

Due to their plastic content and their size they will create the same problems as inorganic materials.

Tips for just the Farmstyle compost toilet


Lower the toilet seat

Keep the toilet seat closed when the toilet is not in use.

Sometimes add organic material
Adding organic material is not generally necessary unless:
  • Long absence is intended and best add green leafy vegetables as food source.
  • Worms seem hungry, such as when chamber has been transformed to complete vermicast, then remove this compost resource and introduce new environment.


Dispose of cigarette butts

DO NOT put cigarette butts or any other burning objects down the toilet.

This has nothing to do with gases; it is to do with the dry toilet paper catching on fire.

Operating and Maintaining a Farmstyle Compost Toilet

General guidelines for the Farmstyle / Backcountry compost toilet system

Air outlet filter

The filter that is located just under the air outlet flange needs to be checked and cleaned if required each twelve (12) months.

Fan control

The current fan is single speed and only needs to be “on” or “off” the current draw is only 1 amp at 12v about 1 quarter of the consumption of a 50-watt bulb! It is best to leave it running all the time.

This can be run by a small solar power pack. (currently being researched)

Cleaning the hygienic chute

The hygienic chute can be cleaned in the toilet pan by using a water spray bottle with a mixture of 1-part white vinegar to 6-parts water. Or dish washing liquid. These will not harm the composting process.

The hygienic chute can be removed and washed in a bucket of disinfectant and then washed down with clean water, before replacing the chute.

DO NOT dispose of the disinfectant water down the sink or basin. Dispose of it outside, maybe in the garden.

Compost removal

It is recommended that the compost is removed once every year.

For holiday homes that are only used for 3 months every year, it is recommended that the compost be removed within 3 years.

Removed compost

The compost (humus) is a resource to be used in your garden. We recommend you apply it only to non-food gardens and cover with mulch or soil.


To avoid light shining down into the toilet chute place the toilet room light near the front of the room, as this will cast a shadow on the chute.

Failure of power supply

If the power supply is off for a longer period than 3 days, place GLAD® cling wrap or plastic over the hygienic chute and close the lid over the cover. Remove the wrap/plastic each time the toilet is required for use, repeat this procedure until the power supply is restored. This is to both stop fumes and any harmful air-born bacteria usually dispersed with the fan.

Maintaining the fan

Remove the fan every 3 years and clean off any dust that has built up on the fan blades. This can be achieved with ease with the use of an old toothbrush. Once cleaned, refit the fan.

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