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Thread: DIY RO - Need suggestions and direction

  1. #11
    Join Date
    Mar 2019


    What would be the theoretical concentration factor and flow of the two options:

    1. 2x150 in parallel then 2x150 in series...


    2. 4x150 is series

    All assuming the 8852 pump with a 5 micron pre filter.


    2020 - 70ish taps on shurflo 4008, 10 taps on buckets. Mason 2x4 XL. DIY R.O.
    2019 - First Season with a Late Start. 10 taps on buckets, block arch and 2.5 gallons of syrup.
    Trout Brook Valley
    Weston, CT

  2. #12
    Join Date
    Feb 2017

    Default Flow Rates

    Hey Bryan,

    The 2x150gpd membranes will get you about 5gph on a single 50/50 pass (taking 2% sap to 4% sap, at 40 degrees fahrenheit). Series and parallel are going to give you virtually the same performance. The membranes will last longer in series and I would suggest plumbing in series. (The reason is that each membrane is subjected to a higher flow rate).

    4 x 150gpd membranes in series should get you around 10gph on a single 50/50 pass (taking 2% sap to 4% sap, at 40 degrees fahrenheit). You could run a higher restriction with four membranes in series (like 75% permeate and 25% concentrate) and get a single pass concentration of 6 to 8% sugar (however the flow rate would be closer to 5gph).

    You would be pretty close to the limit of an 8852 with 4 membranes (unless you use a low pressure feed pump or have a tank with head pressure). The 8855 is a better option and they aren't that much more expensive. You would want something close to a 400gpd rating once you get up to (or over) 4 150gpd membranes.

    Hope this helps!

    The RO Bucket LLC

  3. #13
    Join Date
    Feb 2017
    eau claire


    Parallel will process the sap faster, but require recirculation and a close eye on regulator. As sap % builds you lose efficiency which is why you can do more in parallel. In series you'll pull less water out per minute but it will be a one shot deal. Pm me if youd like more info. Assuming you are building your own from the mattatuck madness plans? That's great info and easy to build saving you alot of money over the RO Bucket. I did that way 1st year and then expanded to a parallel-ish piping setup. I now have a 4x40 setup going.

    Bigger membranes increase volume.
    2016 7 taps= 1-2 gallons of syrup
    2017 135 taps on bags/buckets =17 gallons syrup on block arch
    2018 75 taps on bags/buckets in new locations =50 gallons syrup (2 month season) on insulated barrel stove with auf and hobby r.o.
    2019 less taps on different ground for 1 month season. 20 gallons. Added 4x40 RO membrane and never finished 2x4 cooker.

    Creator and Mod of Wisconsin Maple Syrup Producers on FB

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