SpectraPure's new 99% Rejection Membrane, your potential cost savings explained...

Discussion in 'SpectraPure' started by SpectraPure, Oct 21, 2013.

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  1. SpectraPure

    SpectraPure 3reef Sponsor

    Joined:
    Sep 10, 2009
    Messages:
    25
    Hello-
    I wanted to take some of your time to explain and clarify why our new membranes with 99% typical rejection are so important to your RODI system water production cost of operation. I will also explain why our 99% rejection membrane performance is unique, and when you might want to change your membrane to operate your system at low cost so as to produce high quality water at the lowest cost.

    History:
    In the old days, vendor specs for the "best" membrane were >96%, and 98% typical.
    Of course there were a few with much better rejection in these large batches of membranes so SpectraPure® individually tested each of these membranes to select only a few having the best performance to sell as our "SpectraSelect™” >98% rejection (guaranteed). Those that did not make the grade were used in less critical applications, or if below the manufacturers spec, returned to the supplier.
    Around this same time, SpectraPure also developed an in house proprietary treatment process to enhance rejection, increase production, and decrease rinse up time. We still use this process today, regardless of what membrane source material we use as the benefits are substantial for high purity water production.
    These original SpectraSelect membranes could easily provide a customer with a 2% rejection increase over the bottom end of the specification of the leading membranes of the day (96% rejection being the bottom end of the typical spec, and >98% rejection being our treated, individually tested and verified guarantee).
    Case #1
    You may ask why 98% rejection vs. 96% rejection is important, and how could such a seemingly small 2 % increase could possibly save you money in operation costs.
    Case#1 Impact of going from 96% to 98% rejection on typical feed
    Raw Water TDS (270) 96% rejection (10.1) 98% rejection (5.4) Improvement 200% DI Life DOUBLED

    In this case, going from 96% to 98% rejection increase cuts in half (10.8ppm down to 5.4ppm) the ionic load passed on to the DI section of your RODI system. Cutting this load in half in effect DOUBLES the life of the DI section. In other words, cuts in HALF your DI costs.
    Now, the best just got better
    Our new 99% rejection SpectraSelectPlus™ membrane blows away the competition. It is simply the best available membrane for the money.
    NEW 99 Percent Rejection SpectraSelect Plus
    Our newest membrane is treated with our in house proprietary process to enhance rejection, increase production, and then individually tested to guarantee typical 99% rejection, and a minimum of 98%!

    Is a one percent increase over our old SpectraSelect membrane really worth it you ask?
    Refer to case #2 below; showing a one percent increase at these high levels of rejection DOUBLES the life of your DI! Or in other words cuts your DI costs by half!
    Case #2 Impact of going from 98% to 99% rejection on typical feed
    Raw Water TDS (270) 98% rejection (5.4) 99% rejection (2.7) Improvement 200% DI Life DOUBLED

    The Competition
    As usual, there is a competitor offering a “me too” “99%” rejection membrane, but looking closer, their spec is a minimum of 97%. Again, our SpectraSelect membrane has a minimum of 98% rejection, or at least one percent more than this competitors membrane. Refer to case #3 below In the case of going from 97% to 98%, this is a minimum improvement of 1.5 TIMES the life of the DI section. Still a significant cost reduction.

    Case #3 Impact of going from 97% to 98% rejection on typical feed
    Raw Water
    TDS (270) 97% rejection (8.1) 98% rejection (5.4) Improvement 150% DI Life One and a half

    But what if you only have 97%rejection and you go to 99% with the SpectraSelectPlus?
    Case #4 shows if you go from the minimum competitor rejection spec of 97% to our typical SpectraSelectPlus™ 99% rejection, a TRIPLE life increase in your DI. Triple!

    Case #4 Impact of going from 97% to 99% rejection on typical feed
    Raw Water TDS (270) 97% rejection (8.1) 99% rejection (2.7) Improvement 300% DI Life TRIPLED


    What if you only have 96% rejection, what will 99% rejection do for your operating cost?
    To answer the question of those whom have the fairly typical industry standard 96% rejection membrane, a 99% rejection membrane will quadruple Your Di life. Let me repeat, quadrupled. Please refer to case #5. This is a strong case for keeping the best membrane in your system possible. Rejection performance pays huge dividends in DI life!
    Case #5 Impact of going from 96% to 99% rejection on typical feed
    Raw Water TDS (270) 96% rejection (10.1) 99% rejection (2.7) Improvement 400% DI Life QUADRUPLED

    When should I change my membrane?
    The flip side of this question is when should I change my membrane? Refer to case #6 which shows the impact of your rejection degrading from 98% to 95%, DI life is cut in half.
    Case #6 Impact of going from 98% to 95% rejection on typical feed
    Raw Water TDS (270) 98% rejection (5.4) 95% rejection (13.5) Increase in Ionic Load 40% DI Life >HALVED


    Note: these calculations assume no CO2 which is not removed by your RO membrane, which can significantly degrade the life of your DI. High pH, or contaminates such as chloramines will also affect performance. The typical calculation charts shown reflect the IONIC load improvements relative to each Rejection Improvement.

    I hope this helps you better understand why/how your RO membrane rejection is a prime driver in your RODI water production cost.
    Bruce