[darren9ball]

hi guys
i purify about 3000 liters of water a week
the water goes from
outside tap
to
SPECTRUM Stainless Steel RO Membrane Housing, 4" x 40", 1/2" ports
to
NW-BRK02 2 Stages Water Filter 20Inch - 508mm 5µ Sediment Filter (going from carbon to sediment filters)
to
di system 11ltr (resin)
 
but recently my water has been rising to over 100 after a couple days and i change my carbon and sediment filters and resin and after 4 days the water shoots back up to 100 on the tds reading.
i currently have about 75% waste water

the membrane on the stainless steel housing was only changed a few months ago

i have also tried to flush the system out but it still does it

any info or advice would be great
nothing to technical tho pleas hahah

thanks guys

[Afterglow Window Cleaners]

Hi,

Your water filters should be before the membrane

eg

1.Sediment Filter
2.Carbon Filter
3. Membrane
4. DI

If you really do have the membrane as the first stage, then i have little doubt that it will be knackered as it has been used in the wrong place

[darren9ball]

sorry i do do it that way i got confused

[Afterglow Window Cleaners]

What is your tap TDS?

What is the TDS of the water after the membrane and before DI

[Jonny 87]

What is your tap TDS?

What is the TDS of the water after the membrane and before DI

This ^^^^

You have a fault somewhere in your system, so need to find out where.

It sounds like membrane hasn't been fitted properly and is letting unfiltered water through.

[darren9ball]

Hi mate
took readings from every section heres the results
from tap =409
from sediment and carbon =232
from membrane =148
fronm di =155 now grrrrrrrrr

[darren9ball]

how that figure went up i aint got a clue i have fitted it correct im sure just hope it aint fooked as its expensive to keep replacing but cosing me lots in resin and filters to try keep it down

[andyM]

Are you using a booster pump?
Have you got pressure gauges on your system, if so what are the readings?
If I was you I would definitely check the membrane is seated properly.

[darren9ball]

no i havent got a pressure Gage  or booster pump
the pressure is very powerful from the outside tap i use
could you give me a bit of an insight of where you think its going wrong and how to check if the membrane is knackered
sorry if this sounds silly but how could the membrane move on a sealed secure housing unit
thanks

[Jonny 87]

It's definitely a problem with your membrane. 148 is way too high.

I would take it apart and make sure it's assembled properly.

[darren9ball]

i thought it was the membrane but was really hoping it was not its costing me a fortune keep changing things driving me mad so any idea the best way to check the membrane please

[andyM]

Just a thought but have you also checked your waste valve is set correctly?
As 75% waste is a lot, usually 50-60% is about right.
If you close it up a touch is it having an effect on lowering the tds and increasing the pure output?

[SeanK]

For start your readings are wrong, your sediment and carbon filter does not lower tds as they don't remove dissolved
solids.
I think your TDS meter could be playing up.

[darren9ball]

hi
i have changed the wastage to 60/40
and have took more tds readings
tap  409
filters  387
membrain  80
di 44 (and dropping)

[darren9ball]

is it advisable to get a bigger di unit the one i have is 11l

[SB Cleaning]

Sounds like the RO is shot..

I just had to replace mine after 18 months of use...I put 3000 litres through it a week too...18 months didn't sound like a lot to me but the guy at the cleaning warehouse said it was about right

[andyM]

is it advisable to get a bigger di unit the one i have is 11l

No an 11 ltr resin vessel is fine, no need to change.

[Jonny 87]

For start your readings are wrong, your sediment and carbon filter does not lower tds as they don't remove dissolved
solids.
I think your TDS meter could be playing up.

In high tds areas the sediment and carbon can slightly lower tds. Takes out small bits of grit and sludge that are picked up by tds meters. 

In lower tds areas though your right.

[darren9ball]

its coming out membrane 80
what should it be coming out at baring in mind it starts at 400 where i live
and then i think resin needs changing
so what should it be reading from the membrane is what im askin please

[andyM]

its coming out membrane 80
what should it be coming out at baring in mind it starts at 400 where i live
and then i think resin needs changing
so what should it be reading from the membrane is what im askin please

Anything under 20ppm from the membrane would be ideal.

But it can depend on if you are using a booster pump and the type of membrane you are using.
I use a HF4 membrane which from a tap tds of 280ppm wouldn't go below 30ppm until I got a booster pump which took it down to 8ppm.