I agree with the "Dump it" crowd I have dumped approximately 150 gallons this week. We had three inches of rain last night and I didn't even check sugar content, I just dumped. Since I am only running a half Pint with 50 taps, I carry a sap hydrometer and test every tree. If It isn't 1.5% it is ground wash! Takes way to much time to boil low grade sap when I have plenty of 2.0-2.5% sap.