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RO Booster Pump

Luvlyjub

Member
Joined
18 Feb 2021
Messages
50
Location
Essex
Hi,

I have been using an RO system to cut my tap water and using a 3 stage 100GDP with a booster pump.

Now I am sure I read you need to match the pump rating to the membrane but is this actually necessary?

As I need to change my membrane I have ordered a 150GPD with an increased flow restrictor to hopefully speed up the production process.

So, is it a problem using my 100gdp booster pump with this membrane?
 

Luvlyjub

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Thread starter
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18 Feb 2021
Messages
50
Location
Essex
What pump do you have @Luvlyjub ?

Some pumps are regulated to a set pressure, so won’t exceed 75psi for example.
It's the ECHEN 103-100 - it was meant to be the self-regulating with output 70psi.

They came with options from 50/75/100 or 200 GPD - so I purchased the 100 to match RO unit
 

Geoffrey Rea

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UKAPS Team
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27 May 2017
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Cambridgeshire
That pump should be sufficient with a 150GPD membrane @Luvlyjub .

It’s only when you switch to something like a single 400GPD membrane. Those things are rated to a maximum of 290psi so can handle bigger booster pumps to maintain efficiency without membrane stretch.

Have found running multiple membranes in series with a recycling configuration to be the biggest increase in efficiency if this is what you are after.

For example, running three 150GPD membranes for a total of 450GPD combined with a booster pump rated for 200-450GPD. You can expect a 1:1 waste to product water ratio with a production rate of 1 litre of product per minute.
 

_Maq_

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23 Jun 2022
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633
Location
Czech Republic
Have found running multiple membranes in series with a recycling configuration to be the biggest increase in efficiency if this is what you are after.

For example, running three 150GPD membranes for a total of 450GPD combined
Didn't you mean multiple membranes in parallel?
 

Geoffrey Rea

Global Moderator
UKAPS Team
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27 May 2017
Messages
1,950
Location
Cambridgeshire
Not quite @_Maq_ , referring to a recycling configuration to reduce waste water to overall product water:

Membrane 1: water in, product out, waste fed to…

Membrane 2: waste in from M1, product out, waste fed to…

Membrane 3: waste out, product out.

As below:

1669807006693.jpeg


1669807409203.jpeg


The waste water travels in series, but the product is parallel at exit but not input so not sure how you would classify this with clarity. Picture helps though…
 
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