using cling wrap instead of an air lock

[michael_aussie]

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[GilaMinumBeer]

No. You want the CO2 to escape the fermenter. Try tin foil instead.

 

[mummasan]

Use foil - unless you need a blow off tube then use a blow off tube.

 

[Beerbeque]

I use the plastic film all the time. The gas easily escapes.