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Thread: DIY RO - Need suggestions and direction

  1. #11
    Join Date
    Mar 2019
    Location
    CT
    Posts
    16

    Default

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

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

    or

    2. 4x150 is series

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

    Thanks.

    Bryan
    2019 - First Season with a Late Start. 10 taps on buckets, block arch and 2.5 gallons of syrup.

  2. #12
    Join Date
    Feb 2017
    Location
    NY
    Posts
    22

    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!

    Carl
    The RO Bucket LLC

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