Ro system problem ,help would be appreciated

[BlueWavesReef]

Hello everyone

I have TMC V2 pure 100 gallon ro system ,which I'm having hard time getting my tds to 0 since i bought it
I have added 4th stage and that is DI-RESIN and tds went from 5 tds to 4tds not big different i believe , any idea what could be the problem and how to fix it , any help would be appreciated


Thank you

 

[T-J]

What is the TDS of your source water?
What is your incoming pressure?
Make sure you have the filters in this order: Sediment filter, carbon block(s), RO membrane, DI resin.
What's the TDS of the water going into the DI resin?
What filters are you using (micron size)?

 

[theMeat]

Need more info
What psi entering unit?
What is tds pre and post membrane?

 

[T-J]

I'll also add that DI resin should easily handle 5 TDS. Wondering if their DI isn't packed tight enough....or if your TDS meter is not correct.

 

[theMeat]

All good points
Will add what’s your rejection rate, meaning what ratio of product water to waste water?

 

[Dburr1014]

If the pic is correct, 1.4 bar = 20 psi is not enough.
Also looks like 168 incoming to 4 TDS out?

 

[BlueWavesReef]

yes its around 20 psi
and 168 incoming and 4 TDS out

sorry I'm new to all this
I have changed the filters and the Di resin
these the ones i bought
V2 Pure 5 Micron Cartridge Filter
V2 Pure Active Carbon Block Cartridge
V2 Pure De-ionising resin 500ML

 

[AKG]

yes its around 20 psi
and 168 incoming and 4 TDS out

sorry I'm new to all this
I have changed the filters and the Di resin
these the ones i bought
V2 Pure 5 Micron Cartridge Filter
V2 Pure Active Carbon Block Cartridge
V2 Pure De-ionising resin 500ML

Minimum 40 psi is what you need on a RO unit imo. Though you might have your DI filter installed upside down (if that's even possible) or not seated correctly on the unit.

 

[JoshH]

yes its around 20 psi
and 168 incoming and 4 TDS out

sorry I'm new to all this
I have changed the filters and the Di resin
these the ones i bought
V2 Pure 5 Micron Cartridge Filter
V2 Pure Active Carbon Block Cartridge
V2 Pure De-ionising resin 500ML

Given that you are new to this, can we just confirm the locations of your two TDS probes? Is one place just before the membrane and the other just after?

Do you have a third TDS probe, or just the two?

 

[Dburr1014]

If you can get that boosted to 50 psi, should be good to go.
Is this a well pump or city?

 

[ReefKeeperElite]

If you can get that boosted to 50 psi, should be good to go.
Is this a well pump or city?

Agree, my psi meter says green is between 40-80 psi.

 

[BlueWavesReef]

One between micron and the carbon cartridge and the other one after the membrane , not sure if pics helps

 

[JoshH]

One between micron and the carbon cartridge and the other one after the membrane , not sure if pics helps

And there isn't one after the DI stage correct?

 

[BlueWavesReef]

I have the DI connected before the membrane

 

[Dburr1014]

One between micron and the carbon cartridge and the other one after the membrane , not sure if pics helps

IMO, you know the incoming is high, one should be after the membrane and one after the di.
If 4 TDS is before the di then you don't know if it's 0 after.
When the tester after the membrane reads high then you know to replace it.

 

[JoshH]

I have the DI connected before the membrane

So your current set up is Sediment - Carbon - DI - Membrane ?

 

[Dburr1014]

I have the DI connected before the membrane

DI is always last. Think of it as a polisher.

 

[BlueWavesReef]

Yes

 

[Reefer1978]

I have the DI connected before the membrane

DI Resin should be your last stage, after the membrane.

 

[JoshH]

Yes

Okay well that is a huge problem but easily fixed. It should be Sediment - Carbon - Membrane - DI