RO Flush Valve/Restrictor question

[Syntax1325]

I posted this in the manufacturer thread but haven't received a response yet so I'm putting here to see what happens.

I am using a Typhoon RO/DI unit (75 gpd) with an additional 75 gpd membrane add on kit.

What is the correct flow restrictor/ flush valve for this unit?

I also have a booster pump: I have a psi meter right before the T that leads to both membranes (post prefilter and carbon blocks)... What pressure should this read for optimum product production?

 

[tkeracer619]

80 psi is optimal.

You still want a 4:1 production rate, even with dual membranes in series. I use an adjustable needle valve.

 

[Syntax1325]

80 psi is optimal.

You still want a 4:1 production rate, even with dual membranes in series. I use an adjustable needle valve.

Any idea on the correct flow restrict/ flush valve?


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[Syntax1325]

Bump


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[homer1475]

80PSI?

Every RO/DI unit I researched recommended 50 to 70 psi with 65 being the sweet spot. Anything higher and your just pushing TDS through the membrane(TDS breakout) without it actually being filtered.

NOTE 1:
If your RO production is still not good, you may need a new membrane... if your membrane is new then the cause of your problem is insufficient pressure ... get a PSI gauge and test your water pressure... you would like to get 60 PSI ...

According to Air water ice's website for the 75GPD membrane you would want to 800 fast flush valve, even though you have 2 membranes their still only 75GPD.

https://airwaterice.com/accessories...lush-ball-valve-combined-with-restrictor.html

 

[flooddc]

I posted this in the manufacturer thread but haven't received a response yet so I'm putting here to see what happens.

I am using a Typhoon RO/DI unit (75 gpd) with an additional 75 gpd membrane add on kit.

What is the correct flow restrictor/ flush valve for this unit?

I also have a booster pump: I have a psi meter right before the T that leads to both membranes (post prefilter and carbon blocks)... What pressure should this read for optimum product production?

Here is the recommendatiion for the flow restrictor.
http://www.purewaterproducts.com/articles/flow-restrictors

you will use the 425 or 800 since, technically, you have a 75GPD membrane. Although you have 2 membranes, the first one fed waste water back into the second membrane.So you only need one flow restrictor for the second membrane.

 

[Syntax1325]

I wonder if their recommendation of psi and flow restrictor is based on membranes in sequence. I have mine plumed in parallel. I would think the psi would need to be doubled along with the flow restrictor?


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[homer1475]

Air Water and Ice has a diagram of them plumbed both ways, and I believe it still uses the same flow restrictor.

https://airwaterice.com/media/pdf_files/d/u/dual_membrane_diagram.pdf

You could ask in the Spectrapure sponsor forum, they are very knowledgeable and usually answer a thread in a day.