i would normaly proccess any sap within 4 days of finish from collection and a max of four days on the tree and i have no problems if your uncertaain add one campden tablet per gallon of sap to kill off all bac and other nasties.
campden tablets are for home brew use, try your local wine making shop or tescos direct etc, if your using powderd meta sulf then half a level tea spoon willdo the same effect
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