DIY RO operation help

[DRoseum]

I have a different pump on order that I want to try, it is a self priming pump that is supposed to get up to 160 PSI.

Curious, what pump is that? Make and model? Link to check it out?

[EriobNY]

Restrict output so that permeate and concentrate lines flow the same.


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[Lucky Dog]

There is a set screw on the pump end that will allow some adjustment. Read the instructions. I have mine about 3/4 the way down. This may give you the added boost to your pressure.

Interesting, I'll have to see if mine has adjustment. It never occurred to me to read directions.

[Lucky Dog]

Restrict output so that permeate and concentrate lines flow the same.


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I've got my concentrate like restricted to a fast drip, that is the only way I can get to 80 psi. If I open the flow up any more, I can only get to 4% or so.

[Lanark]

I need help with my home made reverse osmosis, the port on the lower left of the first housing does not push water to the top of the second housing, nor does the left port on the second housing push water to the top of the third housing. Whether the needle valve is open or close the dial on the pressure gauge does not change. The motor is a residential grade reverse osmosis booster pump 200-300 gpd.IMG_0097.jpgIMG_0098.jpgfullsizeoutput_12d.jpg

[carls47807]

Your lower ports in the membranes are reversed. Center is water the one in the right is concentrate.


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[carls47807]

Luck dog,

There is a 2mm Allen screw in your pump head. You can turn it in to increase the pressure.


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[Lanark]

Thank you, my other question then if it's reversed is, on my third housing the left port is 1/4" tubing where all other tubing is 3/8's. Does this make a difference or should all tubing be 3/8's?

[carls47807]

Plumb the three center water ports in 3/8. Plumb the first two concentrate ports in 3/8 and terminate it to 1/4” with a needle valve.


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[Lanark]

I just checked the schematic of the RB20 on the RO bucket site and the concentrate line is on the left of the third housing with the needle valve, so I'm unsure how mine is reversed.