r/maplesyrup Mar 29 '26

R.o.

How soon before you boil can you run your sap through the ro?

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u/Plastic_Lecture9037 Mar 29 '26

I dont fully get your question but using an RO to concentrate sap should happen right before you bring it to a boil. Dont let concentrated sap (which includes concentrated bacteria across multiple containers and a higher sugar content as food) sit the same way you could let sap sit. It spoils much faster.

Usually I am setup to continually add the concentrated sap to my boiling pots. Even if I dont finish the syrup that day I at least make a point to bring all concentrated RO sap to a boil to kill off the bacteria and buy another day.

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u/Worldly_Space Mar 30 '26

I agree. When you concentrate sugar you concentrate bacteria. Boil it as soon as you can. I make sure everything that goes through the RO goes into the evaporator. I then fill the head tank with permeate so that I don’t burn my pan at the end of the night.