On 26/03/2018 15:02, Marland wrote:

According to my other half eggshells will only get broken down efficiently
in a compost bin/heap if you are prepared to pulverise them into really
small fragments first.
Something to do with the ability of worms to ingest material to digest it,
their mouths dont have teeth so all matter has to be soft or small enough
to be drawn in by the mouth muscles
Eggshells just broken in half and chucked in the compost are just too
large.


As a half egg shell migrates down the heap as you put more compostable
material on top it will be crushed into smaller pieces. Even the shells
near the top will be broken down into smaller pieces when you physically
move the compost from the bin and even then they will not remain intact
when putting your foot on it. They don't need to be digested by worms.
The little bits of shell are a mineral supplement in the compost and
will leach into rest of the soil when the composted material is used.


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