Tore through the 600 gal in about 3 hours of evaporator time. SH didn't get above 34F and the floor was slightly icy. Made just a couple quarts shy of a keg, so he sap must be running close to 2%, but the field refractometer has been reading lower, probably needs to be recalibrated. Drained everything including the float boxes and the RO filters, opened all the valves and system drains. Probably have 400 gal in the field tanks, maybe have ice cubes until mid-March? Alas, brain fog, the weather in February had me convinced I'd be planting peas March 15th.