Refrigerate fresh apple juice for 24 to 48 hours. Without mixing, carefully pour off the clear liquid and discard sediment.
Strain the clear juice through a paper coffee filter or double layers of damp cheesecloth.
Heat quickly, stirring occasionally, until the juice begins to boil.
Fill immediately into sterile pint or quart jars, or clean half-gallon jars, leaving 1/4-inch headspace.
Process pints or quarts 5/10/15 minutes and half-gallons 10/15/20 minutes at 0–1,000/1,001–6,000/above 6,000 ft.