[Mick Kent]

My old membrane used to give me 15ppm which over time rose to 50ppm so costing me too much in resin so bought new membrane today and after flushing the filters out and running 4040 for near 2 hours water isnt getting below 57ppm from 50psi unpumped! I bought the hf5 membrane, the membrane before was a filmtech 1 or whatever they are called..
Anyway what could i have done wrong or is this normal and takes ages to bring tds to a suitable level??
Cheers

[Soupy]

In my experience the performance of membranes does increase in the first couple of days. How long did you flush it for?

[Mick Kent]

Flushed for an hour,  the problem when i flush i still have pure being made! Is that normal??
The guy at cleaning spot said after half hour of running it should hit the desired ppm.
Ill have to wait and see i guess.
So if i leave it running for a day or 2 i should see improvements??

Cheers soupy

[Soupy]

Yes it is normal to get pure when flushing.

Check it again in the morning, hopefully there will have been improvement.

[Clever Forum Name]

Having purchased another RO and changing membranes in another. I can honestly say each machine took nearly a week to settled down!

[SeanK]

No you shouldn't be making pure when flushing a 4040 something is either stopping the waste
from running off freely.
Or you have too much water pressure going into it, try turning down the water pressure.

[Spruce]

No you shouldn't be making pure when flushing a 4040 something is either stopping the waste
from running off freely.
Or you have too much water pressure going into it, try turning down the water pressure.

On both the r/o 's I've had/have there has always been a trickle of water from the pure line when flushing. My water psi is 50. I understood this to be normal.

[PoleKing]

No you shouldn't be making pure when flushing a 4040 something is either stopping the waste
from running off freely.
Or you have too much water pressure going into it, try turning down the water pressure.

On both the r/o 's I've had/have there has always been a trickle of water from the pure line when flushing. My water psi is 50. I understood this to be normal.

+1.

[Paul Coleman]

I have an HF5 4040 running inpumped at around 40 PSI.  The membrane is about 3 years old.  Tap input c. 200.  RO output c. 008.
When I flush, no pure water is made.  I have a valve by the RO output that I adjust.  When flushing, it is fully open.  When producing, it is slightly open (allowing about 50:50 waste:pure or maybe 60:40).
I'm no RO expert but that seems to have worked OK for about 3 years.  The TDS does sometimes climb a little if I've been too tight with the valve adjustment and it does sometimes seem to start rising a bit before the pre filters are replaced.

EDIT:  I say that no pure is produced when flushing but in all honesty, if there is a tiny trickle, it would be hard to spot the way I have it set up (opaque JG tubing). If it's just a trickle, I wouldn't hear it as it would probably just run down the inside of the tank slowly.
I will disconnect the pure pipe next time I flush in order to check.

[SeanK]

I wouldn't worry about a small trickle but a 4040 is not supposed to make pure when
flushing.
If its making pure then there is pressure against the membrane pores, to flush properly you
need turbulence against the pores.

[Small but perfectley formed]

Why does a new RO have to be flushed I recently replaced 2 x HF5 I they produced pure straight away these are are pumped at 160-180 psi 

[colin bird]

Flushed for an hour,  the problem when i flush i still have pure being made! Is that normal??
The guy at cleaning spot said after half hour of running it should hit the desired ppm.
Ill have to wait and see i guess.
So if i leave it running for a day or 2 i should see improvements??

Cheers soupy

hi mick when flushing new ro disconnect before it goes into di bottle and drain into a bucket then bin contents as it fills that way you won't put high ppm into your tank prior to ro settling down,also won't waste unnecessary resin
Having said that I use 4040 membranes from pure freedom,flush for 30 mins connect up to di bottle then water 0.00 ppm good luck hope that helps

[CleanClear]

Why does a new RO have to be flushed

They usually come in a sealed bag, and are covered in some sort of solution ?

[richard groves]

My old membrane used to give me 15ppm which over time rose to 50ppm so costing me too much in resin so bought new membrane today and after flushing the filters out and running 4040 for near 2 hours water isnt getting below 57ppm from 50psi unpumped! I bought the hf5 membrane, the membrane before was a filmtech 1 or whatever they are called..
Anyway what could i have done wrong or is this normal and takes ages to bring tds to a suitable level??
Cheers

Did you flush the pre filters before connecting to the ro ? did you put the new ro membrane in the same way as the old one came out ? is it seated and sealed correctly ?
I would have thought 2 hours is sufficient to bring the tds down to its optimum and btw as others have already said i do get a small trickle of pure whilst flushing too.

[Mick Kent]

Water is coming out at 50 still. Maybe i have put it in wrong! I know its the right way round. Will see what it reads in the morn as im puring water now eating through resin at 50ppm hopefully ill get a surprise in the morn and will have dropped lower than 10ppm.

[Rayleigh Window Cleaning Services]

Alright Mick, they can be damaged if they dont go in the right way round I believe, and the reading will be higher than normal.

Hope this is not the case for you.

Steve

[mac74]

Maybe check it with a different TDS meter.

[Mick Kent]

Right tds is still coming out high,i have a booster pump fitted aswell now and water is coming in at 80 psi but tds is seemingly high at 31. This is my 3rd fill of 1000 litres, surly it should have gone down more than that??.
I put the membrane in with the white ring at the incoming end of the housing which i believe is the correct way to do it.
Not sure what else i can do unless this is normal!

[CleanClear]

Right tds is still coming out high,i have a booster pump fitted aswell now and water is coming in at 80 psi but tds is seemingly high at 31. This is my 3rd fill of 1000 litres, surly it should have gone down more than that??.
I put the membrane in with the white ring at the incoming end of the housing which i believe is the correct way to do it.
Not sure what else i can do unless this is normal!

Mick, here's the way it goes in..........