• Bokashi Composting: Everything You Ever Wanted to Know

    September 23, 2020 • GROW, GUIDES, LIFE

    A bokashi compost system is one of the easiest ways to direct food waste away from landfill and create valuable soil conditioner and fertiliser for your garden.

    The Biome community love this type of composting, and have seen incredible success. With the help of an Urban Composter, Emma saw her new clay veggie patch turn into dark earthy loam. Read her recent review:

    “I can’t speak highly enough of the Urban Composter system. We moved into a newly built house a few years ago and I wanted a compost system that would work with a new baby in tow (not too complicated, no heavy lifting). I got the small bucket for the kitchen and we spray pretty regularly with the compost accelerator, generally we go two weeks before it’s truly full and needs burying in the veggie patch. The microorganisms in the accelerator spray break those food scraps down like you wouldn’t believe, I just buried the bucket contents around in successive holes and it would be increasingly rich earthy loamy soil when I got back to the site of the first buried scraps. The spray lasts for ages, 3 years later I’m only now thinking about buying my second refill bottle, original spray bottle and bucket still going fine. Veggie patch is producing well and I get occasional surprise vegetables from seeds from the scraps (so maybe don’t dig it in where you don’t want random pumpkins for example).”

    With so many of you interested in bokashi style composting, we’ve answered your most frequently asked questions all in one place. So read on for everything you’ve ever wanted to know about bokashi composting.

    Bokashi composting - everything you've ever wanted to know | Biome Eco Stores

    What is a bokashi bin?

    A bokashi bin is a small composting bucket designed to transform your food waste into nourishing compost and soil builder. It is small enough to fit in your kitchen or in another convenient area in your home. It doesn’t smell, doesn’t attract insects, is easy to use and will help you reduce the amount of food waste sent to landfill.

    Bokashi is a natural composting method that utilises beneficial bacteria, known as Effective Micro-organisms, to ferment the food waste, and produces no unpleasant odours associated with food decay.  Organic matter is broken down up to 10 times faster than traditional heap composting.

    From this process you gain fermented organic matter loaded with nutrients that must be dug into soil to complete the breakdown into compost, along with a juice rich in micro-organisms that is siphoned off and can be used as a liquid fertiliser.

    The bokashi bacteria are introduced to your bin either in a grain mix or a liquid spray.

    How are the Bokashi One and Urban Composter systems different?

    The main difference between the Bokashi One and the Urban Composter is the size of the bucket and the carrier mix used.  Both systems feature a plastic bucket with a lid, a grate at the bottom of the bucket, and a tap.


    • Bokashi One holds approx. 19L of food waste
    • Urban Composter holds approx. 16L, or 6L if you opt for the smaller City style

    Bokashi mix

    • Bokashi One is a sawdust/grain and uses a specially designed Bokashi One micro-organism mix made up of lactic acid bacteria, yeasts, photosynthetic bacteria, actinomycetes and fungi.
    • Urban Composter is a liquid spray and uses cultures of EM-1 (Effective Microorganisms).

    The Urban Composter EM bacteria is made in a laboratory and does not use any animal products so is vegan.  The Bokashi One mix may contain animal derived ingredients, so is not suitable for vegans at the moment.

    Some people prefer one over the other.  The liquid delivery takes up less space and is less susceptible to vermin/insects (only a problem if the grain is not kept in a sealed container).  Others like the grain because it is dry, is not in a plastic bottle.

    Both options are very good at what they’re designed to do.

    Bokashi composting - everything you've ever wanted to know | Biome Eco Stores



    How do you use a bokashi bin?

    A bokashi bin is very easy to use. The same process applies to the Bokashi One and the Urban Composter bins.

    Remove the bokashi bin lid and add food waste.

    For every 1 cup of waste, sprinkle 1 tablespoon of Bokashi One mix or 3-5 sprays of Urban Composter accelerator spray before replacing the lid.

    Put the lid back on the bin and ensure it is closed properly and tightly.

    Each time you add more waste to the bin, press the layers down using something like a potato masher or cup.  It is important to keep as much oxygen out of the matter as possible.

    Regularly drain the bokashi juice from the tap (you should be able to start draining juice within one week of adding waste). You can use the diluted juice to fertilise plants – 2 teaspoons of juice for every litre of water (do not store for more than a day or so). You can also use the juice undiluted to keep drains clear.

    Repeat this process until the bokashi bin is full. Once your bin is full, the waste is ready to be buried.

    If you have two bokashi buckets, begin the process again in your second bucket, and leave the contents of the first bucket to continue to ferment for another few weeks before burying. Continue to drain off the bokashi juice regularly.

    How do you bury the waste?

    To bury the waste, dig a hole in your garden. The hole only needs to be 20-25cm deep. The compost is acidic when it is first buried, but neutralises after 7-10 days. It is best to wait 2 weeks before planting.

    Do I need to wash my bokashi bin?

    Wash your bokashi bucket out after each use using a natural cleaner or plain water. If you use a cleaner, be sure to rinse well with water, as residue may impact the bokashi grain or spray in the future. Harsh chemical cleaners are not recommended.

    What can I put in a bokashi bin?

    You can put all food waste in the Bokashi One bin and Urban Composter, excluding large bones, liquids and already mouldy food.

    All fruit and vegetable scraps, citrus, meat, fish, dairy, eggs, bread, plastic free tea bags and packaged food can be added.

    Bokashi composting - everything you've ever wanted to know | Biome Eco Stores

    What is the bokashi mix made of?

    Bokashi One uses a specially designed Bokashi One micro-organism mix made up of lactic acid bacteria, yeasts, photosynthetic bacteria, actinomycetes and fungi.  It looks like sawdust or grain.

    Urban Composter contains cultures of EM-1, the original patented EM technology invented by Japanese Professor Teruo Higa.  Urban Composter’s spray is vegan.

    How much bokashi mix do I use?

    For every one cup of waste, add one tablespoon of Bokashi One mix or 3 to 5 sprays of Urban Composter accelerator spray.

    It is better to use too much over too little.

    Bokashi composting - everything you've ever wanted to know | Biome Eco Stores

    How long does the bin take to fill up?

    That depends on how big your household is and how much food waste you generate. A family of four who is fairly conservative when it comes to food waste might take around 3 to 4 weeks to fill their bokashi.

    Does waste compost inside the bin?

    The waste does not break down in the bokashi bin. The waste in the bin is fermenting and will reduce in volume as it loses water content. The complete breakdown of the waste and the compost process occurs when it is buried in the soil.

    Does a bokashi bin smell?

    It won’t smell with the lid on securely, so you can keep it in the house without any problems.

    When you open the lid the waste will produce a sour smell, similar to what a pickle or cider vinegar smells like. Some people find it unpleasant, but others don’t.

    It shouldn’t be a putrid smell.

    If it smells really ‘off’ or putrid it’s time to remove the waste, bury it in the garden, clean out the bin and start again.

    A batch going putrid and smelling really bad is more to do with the contents, weather, human error (too little microbes, not airtight, not draining off liquid), and luck.

    It is important not to let the liquid sit in the bottom of the bokashi for a long time. You might find you need to empty it every few days, especially during warm weather. If you leave the liquid sitting for a long time it may turn putrid.

    Bokashi composting - everything you've ever wanted to know | Biome Eco Stores

    Will it attract insects and mice?

    Ensure the bokashi lid is on securely at all times and drain the liquid frequently to avoid attracting insects and mice.

    If you’re using Bokashi One grain, store it in an airtight container with a secure lid.

    When you bury the waste in your garden, the deeper you bury it the better, as rodents will dig! We recommend it is covered properly with at least 20cm of soil.

    Is a bokashi bin easy for kids to use?

    A bokashi bin is an easy way to introduce composting and gardening to kids. While they may need an adult to remove and replace the lid on the bin, kids can still add food scraps and the bokashi mix or accelerator spray, help bury the waste, drain the liquid and fertilise plants.

    What can you use the bokashi liquid for?

    There are two ways to use the bokashi juice:

    1. Fertilise plants: Use 2 teaspoons of juice for every litre of water.
    2. Keep drains clear: Pour the liquid down the drain. The beneficial bacteria present in the liquid will work to keep drains clear.

    Do not store the juice outside the bin for more than a day or so.  If you do not need to fertilise your plants, dilute and give to a friend or pour on a nature strip.

    How often do I have to drain the liquid?

    It is important not to let the bokashi juice sit for too long. You might find you need to drain the liquid several times a week. In warmer weather you might also notice that your bokashi bin produces more juice.

    What should the bokashi liquid be like?

    The bokashi juice will be an orangey colour and will smell fruity or like vinegar. It will have white fungal threads floating in it or have a thin white coating. Putrid smelling juice should not be used to fertilise plants, and it is best to dispose of this juice by pouring it down the drain. It will work to keep drains clear.

    Will a bokashi bin fit under my sink?

    That depends on whether you get the Bokashi One or one of the Urban Composters and how much room you have under your sink.

    You can see the different sizes below. From left to right:

    • Urban Composter City: 6L, 26cm high
    • Regular sized Urban Composter: 16L, 40cm high
    • Bokashi One bucket: 19L, 45cm high

    Some people might be able to fit it under the sink, while others might need to put it in the carport or convenient place close by.

    Bokashi composting - everything you've ever wanted to know | Biome Eco Stores

    Can I keep my bokashi bin outside?

    You can keep your bokashi bin outside in a cool, shaded spot out well out of the sun.

    White mould or fungi is growing in my Bokashi bin – should I be concerned?

    A white cotton like fungi on the top of your Bokashi waste is a sign that the process is working well. It shows that the microbes are doing their thing and the fermentation is taking place as it should. There is no need to be concerned about this.

    Do watch out for black or very dark coloured mould though. This is not a good sign and you will need to start again. Dig a hole and bury the scraps, wash the bucket out well with a natural cleaner and start again. You will need to wait several weeks before planting where you buried these scraps.

    What if it leaks?

    Regarding leaks – there is only one place they can leak from and that is around where the tap screws into the plastic bin.  Aside from that, the bin itself is a solid plastic mold.  Usually those leaks are solved with screwing the tap and washer in properly.  Occasionally it may be a faulty tap, in which case it is replaced.

    Do the lids seal well?

    Both bins seal well and are long lasting when used with care.  The Bokashi One bin lids are a more supple plastic and have occasionally split after long use, however we have replacement lids available for purchase.  If it was to split in the first year we would replace it.  As with everything, just take care with lifting the lid carefully, and not ‘ripping’ it up.

    How do you empty a Bokashi bin?

    Dig a hole in your garden approximately 20-25cm deep. In an established garden, dig around plants keeping away from the roots of young plants.  Tip the waste in the hole and cover it up with soil. The compost is acidic when it is first buried, but neutralises after 7-10 days. It is best to wait 2 weeks before planting.

    I don’t have a backyard or a garden to bury the waste in, what can I do?

    If you have a balcony, bury the waste in a pot plant container. Cover it with soil or potting mix and in a few weeks it will have turned into even more nutrient rich potting mix. Plant herbs or veggies in the pot a few weeks after you have buried the waste.

    Alternatively, ask a neighbour, family member, friend or community garden if they would like your bokashi waste.

    What if I don’t have a compost heap in my backyard?

    You don’t need a compost heap outside. Simply bury the waste in your garden. If you don’t have a garden, ask a friend or relative or a community garden if they would like your bokashi waste to condition their soil.

    Does a bokashi bin actually work?

    Yes! Using a bokashi bin is an easy and efficient way to reduce the amount of food waste your household sends to landfill and create a valuable soil conditioner and fertiliser in the process. And if you follow the instructions above, you will be on your way to creating a successful ferment in no time.

    How many bokashi bins will my household need?

    Keep in mind that once the bokashi bin is full, it will need to ferment for a couple of weeks before it can be buried. During that time you won’t be able to add waste to it.

    Considering this, at least two bins per household is ideal. That way you can have one in use while the other ferments for a couple of weeks. If you have a big household or produce a lot of food waste, you may need three.

    Bokashi composting - everything you've ever wanted to know | Biome Eco Stores

    Can I add pet waste to my bokashi bin?

    No! No pet waste is allowed in your household bokashi bin.

    Use the EnsoPet bokashi pet waste system for pet waste. Dog, cat, rabbit and guinea pig waste can be added to the EnsoPet system, and it will quickly break down.

    Bokashi composting - everything you've ever wanted to know | Biome Eco Stores

    Do they come with a warranty?

    There is no cover for smells, however, for any faults in the manufacturing (lid, tap, bucket) we will replace – the only exception would be normal wear and tear from use.

    Where can I buy a bokashi bin?

    You can buy Bokashi One bins and Urban Composter bins in the Biome stores and online here >

    What if I have another bokashi related question?

    Email us at shop@biome.com.au or visit us in-store.

    29 Responses to Bokashi Composting: Everything You Ever Wanted to Know
    1. Becky
      October 11, 2018 at 1:30 pm

      How regularly could I bury the food waste in the same spot in my garden? I have an unused raised garden bed, about 1m x 1m. The rest of my garden beds are covered in bark making it harder to dig in. I would like to be able to just use the same raised garden bed of soil to bury the waste in. Is there a period I would have to wait to bury more? Or just pick a different spot in the same bed?

      • Biome team
        October 12, 2018 at 12:45 pm

        You can continue burying the food waste in the same spot, just wait at least 2 weeks or so each time. If you do plan on planting in that spot in the future, wait approximately 2 weeks after the last batch was buried before planting.

    2. October 11, 2018 at 2:05 pm

      My bokashi mix has gone mouldy & clumped together can I still use it to cover the waste in the bokashi bin?

      • Biome team
        October 12, 2018 at 12:38 pm

        What colour is the mould? White mould is fine – you can continue using that. However, black/blue/green mould indicates something has gone wrong. Don’t add this to your bokashi. You can bury it in your garden though.

    3. Sue Brown
      October 11, 2018 at 5:45 pm

      We already use a compost bin & a worm farm for all vegetable matter and other garden waste, and have been considering a Bokashi Bin for meat, bread, dairy and other non vegetable food scraps. If this is all we put in the Bokashi will that work? And can we empty the bin into the developing compost?

      • Biome team
        October 12, 2018 at 12:10 pm

        It would be best to add some vegetable scraps to it every now and then to balance out the protein. You can empty the bokashi bin into your developing compost.

      • Stephanie
        June 9, 2019 at 10:49 am

        Hi Sue,
        I know this was ages ago, but how did you go using both a Traditional and a Bokashi compost? I’ve been considering the same setup.

    4. Isobel
      October 11, 2018 at 6:49 pm

      Can I use the Urban Composter liquid spray with the Bokashi One bucket instead of the sawdust?

      • Biome team
        October 12, 2018 at 12:05 pm

        Yes you can!

    5. October 12, 2018 at 5:46 am

      Great article it answered some questions I had regarding the fermentation process. The Bokashi one contents are also good to add to your existing compostvif you have one outdoors.

      • Biome team
        October 12, 2018 at 12:05 pm

        Excellent. Thanks Nigel.

    6. Katie Lake
      October 18, 2018 at 12:04 pm

      I’m wondering which of the bokashi mix or the spray works out to be most cost effective? How many buckets approximately would one get out of a bottle of spray or a packet bokashi mix? I’m interested to know since this would be an ongoing cost of using the bokashi system.

    7. Lee Harrisson
      October 19, 2018 at 9:31 am

      The tap on my baby Urban Composter leaks. I’ve screwed it in as tight as I can (the tap is now upside down), but it just started dripping again today. Would another washer help?
      Lee Harrisson

    8. Lisa
      October 21, 2018 at 7:41 pm

      If i don’t have a garden to bury the bokashi mix and cant find someone to give it to could i dump the mix in my green waste (grass clippings etc) bin to dispose of?

      • Lara
        October 16, 2019 at 12:22 pm

        You will need to ask your council. Otherwise ask the council about a community garden. Or ask your local garden shop ie: flower power

    9. Elizabeth
      March 18, 2019 at 12:03 am

      Hi, we’ve been using our bokashi bins since the start of the year but are not sure they’re working right. We have 2 bins on rotation (one sits for 2 weeks while the other one is being filled) but the bins are very smelly (like vomit) when we empty them. We don’t have space to dig them into our garden so we’re putting them in a compost bin (the non-tumbling kind) with a thin layer of soil and leaves on top, but after 2-1/2 months we don’t really have any good compost. What are we doing wrong??

    10. Luisa
      June 11, 2019 at 8:42 pm

      I started getting mice in my backyard digging into the bokashi mixture. Is it something I am going wrong?

    11. Ellie
      June 14, 2019 at 6:27 pm

      I find that my bokashi bin tap becomes clogged, stopping liquid from being drained and turning my food scraps into slush. Any advice on how to stop this from happening?

    12. Alexandra Abraham
      July 1, 2019 at 3:02 am

      Hi, a few days ago, I tipped the contents of my very first bokashi composting bin, into my ordinary garden compost container – one I purchased from our local council. I merely spread everything out flat, I didn’t actually stir or mix it in, or try to bury it.
      Today, I opened my garden compost bin to add some garden debris to it – and the inside of the bin was entirely covered by what looked like millions of tiny white moist beads… like a beige polystyrene micro-beads! I guessed it had something to do with the microbes in the bokashi, so I merely scraped them all down into the compost, and mixed it all in. The bokashi contents I had previously added were decomposing nicely, and were barely distinguishable from the original garden compost that had been in there previously.
      I daresay there was no harm done. A bonus was that the little flies inside the bin, which had been a bit of a nuisance, were all gone.
      The moral of the story is, I think, when you add bokashi matter to an ordinary compost bin, be sure to mix it all up well!

    13. Jessica O
      July 31, 2019 at 10:23 pm

      I have used bokashi juice for potted plants, and now mushrooms are growing! Is this normal? Is it safe for my plants?

    14. Louise
      September 20, 2019 at 12:43 pm


      do you sell replacement lids? mine has broken


    15. Helen
      November 18, 2019 at 7:33 am

      Is it good to put paper in my bokashi

      • Biome team
        April 29, 2020 at 1:47 pm

        Small amounts are ok, but we recommend just adding food waste.

    16. Matt
      February 16, 2020 at 2:18 pm

      Can you add the liquid juice to a watering can and spread over your grass to improve soil below?

      • Biome team
        April 29, 2020 at 1:46 pm

        Yes, you can

    17. Natalie Oudyn
      May 6, 2020 at 11:59 am

      Hi. Why can’t I use the Bokassa grain/sawdust mix in the urban composter?

      • Biome team
        May 13, 2020 at 1:51 pm

        Hi Natalie, you can use the Bokashi One grain in the Urban Composter.

    18. Shelby
      June 20, 2020 at 2:07 pm

      Can I tip the contents from my Bokashi composting into my worm farm?

      • Biome team
        July 17, 2020 at 12:31 pm

        I wouldn’t advise doing that. It’s best to bury the fermented bokashi waste in your garden or add it to an existing compost system. Worm farms can’t take all the waste a bokashi system can (citrus, onions, etc), plus it will be fermented, so it may disrupt the worm’s environment.

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