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Old February 24th, 2013, 10:02 AM
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Default Waterguy ro/ 4" membrane

I have a 2 membrane Ro it will take out almost 50 % of the water on first pass. I am wondering if its possible to take out more water with this system maybe closer to 75%. I don't know if added a 3rd membrane in series would help or hurt. Has any company built a machine capable of removing 75% with a 4" membrane? Any help I would appreciate
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Old February 24th, 2013, 05:32 PM
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Any maple sap RO with 2 4'' membrane can concentrate from 2% to 8% without any problem if it have enought re-circulating flow and applied pressure.

If its to hard in 1 pass, you can re-circulating or do it in 2 passes.

Do you have a RO on a sap tank or a standard model?

Last edited by Mathieu; February 24th, 2013 at 06:08 PM.
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Old February 24th, 2013, 06:10 PM
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Default water guy ro

I have a water guy ro with 3 membranes and do about the same 50%. No recirculation pump on machine so we 2 pass to get to 8%. No worries with it only run about 250 psi could go higher psi but chose not to.


Good luck. Mike
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Old February 24th, 2013, 07:36 PM
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It is a standard model with no recirculation. Vessels are plumbed in series the vessels will handle 300psi but was told to run at 225. The system came with nf270-4040 membranes. Needle valve on concentrate line to control pressure. Would it be OK to run higher pressure to get higher concentrate.or do I need to somehow add recirc loop?
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Old February 24th, 2013, 07:46 PM
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That is the one ! I generally run at 200 -250 psi
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Old February 24th, 2013, 07:48 PM
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I concentrate and empty one tank then concentrate the concentrate for a secondpass
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Old February 25th, 2013, 07:35 AM
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That's my issue I am trying to get more out of the Ro per pass. If I can modify my Ro to get higher concentrate it would be a huge time savings.
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Old February 25th, 2013, 01:55 PM
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the only way you will get more on one pass is to add recirculation to your setup. This will keep your membranes "flushed" clean, allowing them to work more efficiently. I started a thread a while back about adding recirculation to these simple systems. With the NF270, you will need to watch how far you push the concentrate as they are nano filtration and will pass sugar if you try to concentrate too far. but 8% should be fine.
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Old February 26th, 2013, 09:49 PM
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I have the 2 membrane Waterguy Ro. I usually run at 225 psi and am taking out about 60% of the water one pass and I am getting about 360 gph flow at that. I have run up to 75% and the flow drops way down and pressure goes over 250psi. I found running at 225 and taking out 60%+/- I do not plug the membranes. I run my raw sap first and concentrate into my head tank (600 gallon) then recirculate that till I reach 10-12%.
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Old March 2nd, 2013, 06:35 PM
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So last night I ran 1.9 sap to 5.5 in one pass at 220 psi just trying something different it worked well.
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