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Bokashi effective microorganisms

Updated: 23 October 2026

A flat in a UK winter still produces cooked scraps, and a council caddy that refuses meat is a poor match for a Sunday roast. Bokashi effective microorganisms, in the form most households actually buy, are a bran you layer in a sealed bin so the waste pickles for about a fortnight. The solids are pre-compost, not potting mix for the same afternoon. None of the six liquids on the [effective microorganisms comparison](/hub/diy-supplies/effective-microorganisms) is a bran bag. Peter F. used the Royal Horticultural Society and Dr Forest's bran page. We did not run a bin. A qualifying purchase through our links can earn a commission at no extra cost to you.

A flat in a UK winter still produces cooked scraps, and a council caddy that refuses meat is a poor match for a Sunday roast.

Our top picks

Moutta Microferm 5 litre ready liquid

Best overall

Moutta Microferm 5 litre ready liquid
7.5/10about £44.90
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Moutta Microferm 2 litre ready liquid

Alternative

Moutta Microferm 2 litre ready liquid
7.5/10about £27.99
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Moutta EM-1 1 litre stock

Rank 3

Moutta EM-1 1 litre stock
7.8/10about £39
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On this page
  1. 1.What the bin is doing
  2. 2.How a UK bin is run
  3. 3.Tea and the fortnight in the soil
  4. 4.A caddy and a garden spray are two buys

What the bin is doing

Bokashi is an anaerobic pickle. You exclude air, you add a carrier that already holds the culture, and you drain the liquid the waste throws off. The sealed bin is how cooked food, meat, and dairy stay indoors. The RHS describes the output as material you then finish in a compost bin or a trench, and you wait before you plant into that spot. The carrier is bran, sprinkled on each layer. Dr Forest's bran page is explicit that meat and dairy get a heavier sprinkle. Liquid from this comparison does not replace that bran, and a ten-litre canister of EM-1 is a mismatch of volume and stage. If you only wanted a soil drench, use the buying guide.

How a UK bin is run

Chop large pieces so they do not leave an air pocket. Add a few centimetres of scraps, sprinkle bran, and press the layer down so the air leaves. The RHS says bran every few centimetres. Dr Forest says the same layering, with extra bran on meat and dairy, then a seal. Drain the tap every couple of days. Leave the tea in the bin and the waste sits in its own juice. When the bin is full, leave it sealed. The RHS says about two weeks. Dr Forest says about two to three weeks. Black or green mould is the stop sign on the RHS page. A rotten smell means empty the bin if the fortnight is already foul.
Moutta Microferm 5 litre ready liquid

Testsieger

Moutta Microferm 5 litre ready liquid
7.5/10about £44.90
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Tea and the fortnight in the soil

Two UK sources disagree on the watering can, and this page will not invent a third ratio. The RHS dilutes bokashi tea at about 1:10 for plants. Lean Green Home uses about 1:100 for plants, and also mentions neat tea down a drain as a household tip. Use 1:10 when you are following the RHS, and 1:100 when you are following the other guide. A neat pour is not a promise that tea clears a blocked trap. The solids are pre-compost on the day you open the bin. They can burn roots if you plant into them at once. The RHS sends them to a compost bin or a trench. Dr Forest says to bury them about 20–30 cm deep.

A caddy and a garden spray are two buys

A household that wants both a caddy and a garden spray still buys bran for the bin. The spray, if you make it from EM-1, is the activation recipe on the how to activate EM-1 page, and a first brew is the 1 litre, not the 10 litre stock. Microferm is the ready liquid if you will not brew. Neither is labelled as bran. Sit the bin out of direct sun, where you can reach the tap.

Common questions

Do I need EM-1 liquid or bran?
For the kitchen bin, you need inoculated bran and an airtight bucket with a tap. The EM-1 canisters in this set are mother culture you activate for a garden brew. They are not a substitute for the sprinkle on each layer. A 10 litre stock at £299.99 is far more volume than a caddy uses.
Can cooked food, meat, and dairy go in?
Yes, in the amounts these UK guides describe, with extra bran on meat and dairy. That is the reason to choose a sealed bin over an open heap. Large bones and a lot of liquid oil are the usual exclusions. Chop big pieces so you can press the air out. A whole roast carcass with no bran is how a bin turns rotten.
How long until I empty the bin?
Fill at your own pace, draining every couple of days. Once the bin is full and you can leave it shut, the RHS says about two weeks and Dr Forest about two to three weeks. A second bin lets you keep adding scraps during that rest. Opening the sealed bin every evening to add a teabag undoes the airless fortnight.
What do I do with the solids?
Treat them as pre-compost. Bury them about 20–30 cm deep, or add them to a compost heap, and wait before you plant. They are a poor potting mix on the day they leave the bin. In a flat, arrange soil or a heap before the fortnight ends.
How do I dilute the tea?
The RHS figure is about 1:10 for plants. Lean Green Home uses about 1:100, and mentions neat tea on a drain as a household tip. Follow one of those two sources rather than a blended number. A neat dose is not a claim that the tea unblocks a waste pipe.
Is a vinegar smell a failure?
A vinegar or pickle smell is the ferment the RHS calls normal. A rotten smell is the failure, along with black or green mould. White growth can be acceptable fermentation, and it can also mean the lid is leaking, so check the seal. If the batch is foul, more bran helps only while you are still filling. After that, empty it and start again.

Related pages

Best effective microorganisms

Effective microorganisms

Effective microorganisms buying guide: pick a stage

EM-1 or Microferm: dormant culture or ready liquid

How to activate EM-1 mother culture in a sealed jar

Sources

Public UK sources and the amazon.co.uk listings compared on this page. Updated 22.10.2026.

  1. HSE: Biostimulants (retrieved 22.10.2026)
  2. HSE: Biopesticides (retrieved 22.10.2026)
  3. Regulation (EU) 2019/1009, Annex I (retrieved 22.10.2026)
  4. The Fertilising Products Regulations 2020 (retrieved 22.10.2026)
  5. RHS: Bokashi composting (retrieved 22.10.2026)
  6. Agriton UK: EM-1 (retrieved 22.10.2026)
  7. Moutta Farm UK: EM-1 mother solution (retrieved 22.10.2026)
  8. BioBizz: Microbes (retrieved 22.10.2026)