[U.S. wfp USER]

I hooked up my prefilters and my 4040 RO today and the water its producing is no better then 60tds.

I started with only 150 tds.  What could be wrong?

[Alex Gardiner]

Often these 4040 membranes need 'bedding' in. Try running it for 24-48 hours solid and see what it's like then.

[U.S. wfp USER]

Alex,

Thanks for the insight.  Should I run it at 50/50 or what?

Thanks.

[JM123]

Hi Shawn - like I said in my e-mail to you, it needs to be flushed for at least 2hrs before use.

[U.S. wfp USER]

flushing now.  we'll see what happens in a few hours.

[U.S. wfp USER]

Man I feel like a newbie all over again.

After flushing at 100% waste for 2 hours how long do I have to wait with it at 50/50 to get a good reading?

Thanks

[U.S. wfp USER]

Flushed for 2 hours

Ran it for 1 hour at 50/50

TDS is 50  out of the tap its 150.

Not too good.

[sair]

how much water  does it make, what is your water presure, if its too low the longer 20 inch pre filters you have can make a problem and allow insuficient presure

or is it in the housing the wrong way around

[U.S. wfp USER]

Here are some photos.

The water pressure out of the tap is 82psi.

When the ro is set to 50/50 it reads about 55psi.

I ran the unit at 100% waste for 2hours yesterday.  After that I set it to 50/50.  After 20 mins it read 80tds.  After an hour at 50/50 it read 50tds.

What can I do to get this thing working more efficient?

[U.S. wfp USER]

another photo

[Roy Harding]

It looks fine the way you have set it up.

One question you do have the out flow from your fillters to the out side hole in the r/o and not the in ?


Roy

[U.S. wfp USER]

The flow going into the ro is off center.  Waste is off center on the other end with the product water being on center.

I just ran it again for another 1.5hours. 

50tds at 50/50 was best.  If I set it to 80% waste 20% recovery then the tds goes down to 35tds.

The psi on the membrane is lower at 80% waste then at 50/50.  At 50/50 its at about 60psi and at 80% waste its at about 20psi.

I dont get it.

[Roy Harding]

I would do the following

1      take a tds reading after your pre fillters to see if the r/o is ok

2      If the tds is the same as after the r/o then you know its the r/o

3      I would take mebraine out and see if the O rings are seated right

4      Re seat the mebraine in the housing and take tds reading if still high

5      I would say a faulty membraine.


Roy

[U.S. wfp USER]

Maybe I should start with the membrane itself.  Here are some photos.

It came wrapped with a label with the manufacturers info on it that I removed.  The membrane itself is wrapped in a white tape material.  Im assuming that this is NOT to be removed.  Correct?

[U.S. wfp USER]

The end with the black seal/brine seal is the end I use for the inlet end in the housing.  Correct?

[U.S. wfp USER]

Photo of the other end of the membrane.  No black seal on this end.  This end is used as the product end when in the housing.  Correct?

[U.S. wfp USER]

up close photo of the white tape wrapping the membrane.  NOT to be removed, correct?

[Jeff Brimble]

On my small usa ro from ro-man the tap water supply (red) goes into the first sediment filter then through the second filter, the pre filtered water then goes into the single inlet of the RO housing(green). The ro slides into the housing from this end cap and the seal is tightened at this end. The water is forced thro the membrane and exits thro one of two outlets at the other end/base, one is the product water usually blue which can then go to a DI if needed and the other is rejection/waste (green) and goes to drain.

150 tap tds is not significantly high. Low is 50 high is 350 So there is something wrong it should be about 000 after the RO. Dont remove the tape. 80psi is a good tap pressure so its not that.

[Roy Harding]

I have not taken my 4 x 40 out of the housing but should there be 2 seals on at each end as there is a grove for one?

Roy

[U.S. wfp USER]

I was told there only is one seal and it goes on the inlet end of the housing/membrane.

On the other end the waste flows out of the membrane outside of the membrane and putting another seal would only cause all the water to go into the membrane?