Which RO membrane is best?

[backyardboy]

Hi all, looking to build a small RO for my operation to cut down on time and wood consumption. Looking to use a 4" x 40" membrane. What are your opinions for the best membrane to use?

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[Urban Sugarmaker]

I have a Dow XLE 4040 that I really like. It's a popular membrane for maple RO. Now that the MES 4x40 is available I would get that. Great price and designed specifically for sap. Better than the XLE in terms of its performance numbers.

[Russell Lampron]

If your max pressure is going to be under 300 psi and you're not going to concentrate into the teens a Dow NF-270 is a fast flowing membrane. It will pass sugar at higher pressure and higher concentration percentage.

[bowhunter]

I agree with Russell, the NF membranes are great for small ro systems running under 300 psi. I have one I've been running for 2 or 3 seasons. It works great and I have never passed any sugar. My pressure is always less than 250 psig.