15 overnight.  Sunny but cold today only 31.  Checked the tanks first thing this morning.  We kept all the tanks liquid, no ice.  The R/O water tank had a heating tape so it didn’t freeze.  We took down the pipe from the storage tanks to the evaporator.  Wrapping in heating tape is a hassle and not 100% effective.  Turns out the pipe is pretty easy to take down and store in the heated R/O room.

Had to haul 100 more gallons of water to clean the R/O membrane.  We used the same hose setup we figured out yesterday in the snow storm.  That was a lot of trail an error. Today we were much more efficient.

By 11:00 we were running the cleaning cycle on the R/O.  By 1:30 PM we started concentrating.  Everything worked.   Our cleaning and off season storage were adequate.  Had a few leaks from loose fitting that we quickly fixed.

Sap went in the R/O at 2 degrees Brix and left at 5 degrees Brix.  That’s a 17:1 ratio.  By 2:00 PM we were cooking concentrate.  Took the first batch of syrup off at 5:00 and the second batch at 7:00 PM.  Cooking concentrate is faster.  Its worth the hassle of setting up the R/O.  Back to the house by 7:45 PM.  Took down the storage tank pipe again.

Tonight down to 7.  Still 200 gallons of sap for tomorrow, but that should go fast now that the R/O is ready to use.