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Old 10/22/2007, 05:30 PM   #1
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Another perspective on Booster Pumps...

Another perspective on Booster Pumps for RODI systems

We often are asked the questions, “If you operate your RODI system at less than optimum tap water pressures, what is the downside? Is there a negative?”

To help answer these questions, I have provided data (below) that shows the actual results of various pressures applied to a typical RO membrane.


Membrane Pressure GPD Measured % Rejection % Increase
35 39.3 97.5
45 55.2 98.2 0.7
55 67.9 98.3 0.8
65 81.8 98.3 0.8
75 97.7 98.5 1.0
85 111.5 98.7 1.2

Note: 80.8 F, .932 TCF, 950ppm TDS, 1150 uS,
OPCF 7 psi; corrected psi 67


Generally speaking, production rate is directly proportional to operating pressure. It can be seen in this example that raising the pressure by the use of a booster pump from 35 pounds (a commonly found pressure in many homes and offices, especially as demand fluctuates during busy periods) to 75 pounds increases production rate by a whopping 2.5 times! This is the primary and most common reason for adding a booster pump to your system (either an RO or an RODI system)
you want to make more water faster! In cold-water locations, a booster pump can also increase the production rate, as production rate is proportional to water temperature.

Another reason for booster pumps that is often over looked, is that in hard water locations (many places in the country) % rejection improves significantly with the increase in pressure provided by a booster pump. Our data above shows a rejection performance increase from 97.5% to 98.5%, or about 1%. How important is 1%? The rule of thumb for DI resin capacity is for every 1% RO membrane rejection improvement you get a 25% increase in DI cartridge life (due to the reduced ionic load). Thus, with this particular RO membrane as an example (they do vary somewhat), you can see that operating an RODI system at higher pressures (75 psi) will gain a 25% increase in cartridge life over lower pressures (35 psi). In other words, with a 25% gain, every fifth DI cartridge is free! As DI cartridge changes are a significant cost of producing DI water over the life of your system, a 25% increase in cartridge life can add up fairly quickly.

bh



Last edited by BlueCorn; 10/26/2007 at 10:58 AM.
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Old 12/20/2007, 02:56 AM   #2
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My pressure in the summer was about 27lbs. now its about 15-20maybe. Can you help?
How does that booster work?
Please PM me so I dont loose this link. Still getting used to the computing era.


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Old 12/20/2007, 12:02 PM   #3
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Pressure drops when pre-filters plug up.

The booster pump installs on the tap water line and increases the pressure on the membrane, making more water. See them here:

http://www.spectrapure.com/St_kits_p3.htm

Scott
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Old 05/22/2008, 04:09 PM   #4
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Your data leaves me with 1 question.
What is the waste at each pressure? Gallons or ratios, when doing these test. Or was the ratio adjusted to 4:1 for each pressure?


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Old 05/22/2008, 04:49 PM   #5
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The ratio is always adjusted to 4:1 after the temperature and pressure are established.

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Old 05/22/2008, 10:03 PM   #6
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So for most ROs that have fixed Resistors, will their ROs rejection improve with pressure, without readjusting the resistor?

For example, if the average RO is preset for 60 psi @ 65 degrees and 4:1.
They just put a booster pump on it. it goes from 45 psi to 85psi will there rejection rate go up?

I guess this may seem like a dumb question, but it seems to me that most people do not readjust their ROs ratios.


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Old 05/22/2008, 11:04 PM   #7
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Our systems NEVER use fixed flow restrictors. There is no average. Deviations from 60 psi and 65 deg temp are everywhere and one size does not fit all.

Regarding your example, the waste to product ratio will be smaller. Too small, and you'll plug up your membrane.

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Old 08/17/2008, 09:01 PM   #8
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Question: I have steadily seen good rejection rates across my membrane for the last year. All of a sudden (within the last month) my rejection rate has declined to 0%. My water pressure is at 40psi. I am about to make a filter order; should I get a new membrane? Also, should I get a booster pump, as well? I've heard that membranes should last 5-10 years, so either my negligence to change out the pre-filters has ruined my membrane or my water pressure is a little too low. Your thoughts?


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Old 08/17/2008, 09:24 PM   #9
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If you mean, by 0%, that the RO output has the same TDS as the tap water, then the membrane has probably been ruined by chlorine exposure getting past an exhausted carbon filter. Water pressure is not a cause of this.

Change the pre-filters more often and/or get a chlorine test kit to monitor chlorine break-thru in the carbon filter.

A booster pump will increase the production by 50% and improve the quality by a couple of %.

Has the pressure dropped any in the past year as the pre-filters plugged up?

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Old 08/17/2008, 09:33 PM   #10
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That is exactly what I mean by 0% rejection. There has been no pressure drop. I guess its the chlorine breakthrough. A very costly mistake on my part. I think I will skip the booster pump in light of the $200+ for all new filters including membrane. Thanks for clarifying!


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Old 12/12/2008, 03:44 PM   #11
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I have a dual meter Spectrapure MC RODI-90.
Do these meters have to be calibrated at all?
Just changed the prefilters and it's reading(in-119/out000)(in-000/out-000) Now is that reading normal or should that first number be lower?


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Old 12/12/2008, 03:59 PM   #12
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The first number is your tap water. 119 is pretty good, that's why all the other numbers are 000. The membrane is taking virtually everything out and the DI's have little work to do.

Scott
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Old 12/12/2008, 04:06 PM   #13
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The last two filters are DI MC 10 and DI SB 10.
When its time to change them I see the DI MC 10 offered on your site but not the DI SB 10. What one do I need for the last filter?
How is the bulk resin used or is it not for use with my application?


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Old 12/12/2008, 04:12 PM   #14
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The SilicaBuster is located directly below the MaxCap on the web page:

http://www.spectrapure.com/St_replac_p4.htm

Bulk resin is not available for the MC and is not advisable for the SB. They are both complex carts needing precise mixing and layering.

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Old 12/12/2008, 04:29 PM   #15
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Ok, I see it now, Thank You for the help!!!
Will be placing my order soon.


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Old 06/23/2009, 03:09 PM   #16
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there is so many booster pump on your site,,,so which one would work for my 90gph maxcap,,,my pressure is sitting at 40psi allthe time,,,thanks


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Old 06/23/2009, 03:14 PM   #17
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You will need the High Flow Booster Pump, BPHF with optional level controls.

Scott
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Old 06/23/2009, 05:12 PM   #18
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BPHF-MO-115
115 100 (378) $199.99 11.5 / 5.2
BPHF-MO-230
230 100 (378) $204.99 11.5 / 5.2

which one?


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Old 06/23/2009, 05:18 PM   #19
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-115 means uses 115volts
-230 means uses 230 volts

Scott
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Old 06/23/2009, 10:07 PM   #20
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ok thank


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Old 09/02/2009, 04:16 PM   #21
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Note- our booster pumps went on sale:



http://www.spectrapure.com/email/cu...eciation.html#1

bruce


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Old 09/03/2009, 10:12 AM   #22
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sorry, bad link. Try this

http://www.spectrapure.com/email/cus...ciation.html#1


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Old 09/03/2009, 01:21 PM   #23
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i have old 60 gpd MPDI 4 stage I think, but currently I have the 40gpd membrane and flow restrictor. Would either low flow/high flow booster pump work? I plan to order 60gpd membrane and flow restrictor when it comes time to replace.


thanks,


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Old 09/04/2009, 08:50 AM   #24
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We recommend the high-flow booster pump for 60 GPD to 100 GPD.

Scott
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Old 09/01/2012, 08:10 PM   #25
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What is the difference between the auto and manual? I am also looking at booster pump for my Max Cap 90 gpd


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