Rodi flow restrictor

[OGFrenchHorn]

I rebuilt an old vertex puratek. I’m using 2 75 gpd membranes. The 2 waste lines T into a single drain and then go through the auto flush system. Should my flow restrictor be 75 gpd or 150 gpd? My municipal water sucks. It’s basically well water. Should I use a less restrictive flow restrictor? I’m running a chloramine monster and 3 carbon blocks before the membranes.

Thanks in advance Vance’s for the advice


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[Dooly]

i use a 550ml/min flush valve for my 150gpd system which is the same as yours 2x 75gpd membranes
i think the flow restrictor is based on the individual membrane size and not the total gpd capacity

 

[OGFrenchHorn]

i use a 550ml/min flush valve for my 150gpd system which is the same as yours 2x 75gpd membranes
i think the flow restrictor is based on the individual membrane size and not the total gpd capacity

Thats what I’m thinking. This was a 1:1 unit but I don’t think that the stock restrictor is either bad or not good for other membranes. I’m thinking of getting both restrictors and see which give me a lower tds output.


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[Dooly]

keep us updated, I find myself having to replace my restrictors every couple of months as they start getting too noisy, but haven't thought of trying a larger size

 

[OGFrenchHorn]

Will do. Theoretically speaking, the larger one should produce better quality water since it doesn’t build as much back pressure to push more tds through the water


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[OGFrenchHorn]

Put the 75 gpd flow restrictor on and tds dropped to 13/14 tds. The 800cc restrictor will be here on Tuesday


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[OGFrenchHorn]

So after a few days the tds climb up to 21 with the 75gpd restrictor. I installed the 800 restrictor today and it made a huge difference! I have new membranes and housings coming in. I’m sure good membranes will drop tds even more.

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[OGFrenchHorn]

Well, I’m bought a 800 flow restrictor with a manual flush valve and some 75gpd membranes from BRS. The flow restrictor is loud and I get better tds numbers from the regular barrel type restrictor. I found some membrane housings with a built in pressure gauge. I think they look way cool haha. Anyway, I’m getting higher numbers with the BRS membranes that with the Amazon ones. When these get spent I’ll try 99% rejection rate membranes and see where we get with those.

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[ndrwater]

Following...
My city water is total garbage, so anything to help will be a good thing

 

[OGFrenchHorn]

Following...
My city water is total garbage, so anything to help will be a good thing

I really think those 99% rejection rate membranes with a bigger restrictor will work better.


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[OGFrenchHorn]

Well, here a picture of what it looks like now

TDS creep is a mofo! I added valves so I can let product water go to the waste line, when I first start production, until the tds drops. Once it drop to around 15ppm I switch things so it can go through the triple di chambers.

I don’t know much about tds creep but I’ll start researching it. Next time around I’ll check out the spectrapure 99% rejection membranes.


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