A MURKY CLOUD HAS APPEARED IN MY BOTTLE OF BIRCH SAP, IS THIS NORMAL?
This murky cloud is completely natural and arises as the result of fermentation.
This is completely normal and means that bacteria are developing. Over time, the sap turns cloudy, grows whiter and its flavour becomes markedly more acidic.
If you have an especially abundant harvest, you can freeze some sap. Freezing can alter the sap’s physical appearance and can also make it turn cloudy.
Disinfecting the equipment :
To prevent fermentation happening too quickly and protect the trees, remember to clean your equipment with white vinegar or bicarbonate of soda.