Down to 16 overnight.  We expected 25 overnight.  Warmed to 42 with the sun.  But not a big run today.  Collected 150 gallons.

 

Cooked all day starting at 7:15 AM and finished by 7:15 PM.  Five batches into the milk can.  But something changed with the sap.  After the third batch the pan starting getting a nitre build up.  This causes trouble with boiling because the nitre coats the pan and amplifies the heat causing the sap to boil over, even with a small fire under the pan.   You can not boil hard.    We clean the pan at the start of the day to prevent the nitre build up.  This has always worked.  We could boil 12-15 hours.    But after six hours today we got a nitre build up.  We stopped to clean the pan but that did not solve the nitre problem as it came right back.    It has to be something different in the sap, but what?  This could add a lot of time to boiling because we can not fire and boil hard.

 

Still over 300 gallons to cook tomorrow.