Back when I tapped about 40 trees, and before I got a refractometer, I would boil everything that was in a sap bucket. Yesterday I picked up 100 gal, filled two blue barrels. Lots of chunks, some slush. I pumped what I could up into the tank, 80 gallons. Twenty gallons of ice left. I let some melt, put it on the meter, absolutely 0 sugar content. I checked the tank right after, mines been a steady 2% all season - tank was 2.2%. So, I guess over the years I lugged & boiled a lot of ice for naught - Live & learn.