RODI PROB

[tom reilly]

The TDS was starting to creep up on my RODI unit so I replaced DI resin,the carbon cart, and the paticulate cart. Making water for water change and in about 35 gallons the DI resin has changed color and TDS is creeping up again. I have a water softener which should help make it last even longer. Any ideas? Thanks in advance.

 

[haanstang]

The TDS was starting to creep up on my RODI unit so I replaced DI resin,the carbon cart, and the paticulate cart. Making water for water change and in about 35 gallons the DI resin has changed color and TDS is creeping up again. I have a water softener which should help make it last even longer. Any ideas? Thanks in advance.

What is the TDS of your water before it goes through your rodi?

 

[tom reilly]

What is the TDS of your water before it goes through your rodi?

TDS is 235 after the water softener. I'm in south Texas our water comes right out of a limestone aquifer.

 

[jaws789832]

What RO/DI unit do you have? And are you sure the cartridges are in correctly. Only reason I ask is I put mine in upside down one time and it pretty much did the same thing until I realized my mistake.

 

[mcarroll]

And what's the TDS after your RO membrane?

 

[tom reilly]

What RO/DI unit do you have? And are you sure the cartridges are in correctly. Only reason I ask is I put mine in upside down one time and it pretty much did the same thing until I realized my mistake.

Its from Fountainhead Water Systems. Yes its put together correctly. There is no upside down on these carts.

 

[tom reilly]

And what's the TDS after your RO membrane?

At this point its 6, but the resin has all turned from blue to brown which means its exhausted.

 

[haanstang]

Is this rodi unit new?
You could always add a Di canister after the first.

 

[tom reilly]

And what's the TDS after your RO membrane?

TDS is 9 coming off the membrane. I guess I need to replace it. ok, question now is can I use the 40 gals of water I just made. TDS on it reads 0.
Nitrites, trates,and phos test 0 on new water.

 

[tom reilly]

Is this rodi unit new?
You could always add a Di canister after the first.

Not new but less than 750 gals to date. I was told it was good for @ 3000 gals. It took less than 50 gals to exhaust a new refill if DI resin. Something else is wrong.

 

[haanstang]

Not new but less than 750 gals to date. I was told it was good for @ 3000 gals. It took less than 50 gals to exhaust a new refill if DI resin. Something else is wrong.

Hmm... I don't remember for sure but I think 9 is kinda high coming out of the ro membrane.
As far as your 40 gallons made with higher tds if it was me I wouldn't use it but that's just me.

Just reread your post. If it was 0 tds I would use it. Even 1 tds is ok

 

[tom reilly]

Hmm... I don't remember for sure but I think 9 is kinda high coming out of the ro membrane.
As far as your 40 gallons made with higher tds if it was me I wouldn't use it but that's just me.

Just reread your post. If it was 0 tds I would use it. Even 1 tds is ok

Appreciate your input. Ordered new membrane. Got enough to keep ATO and 35 gal water change till it comes.

 

[mcarroll]

At this point its 6

TDS is 9 coming off the membrane.

That's either 96% or 97% rejection....I'm not sure that's your problem. Can 6 ppm blow out a DI cart in 50 gallons?

How's water pressure? How's the rejection rate (wasteroduct)?

What TDS do you get from measuring the final RODI product water? (The blue is a dye and doesn't necessarily reflect DI activity.)

 

[tom reilly]

Thanks for help and suggestions. I ordered a new 150 gal membrane. That way all will be new.

 

[Buckeye Hydro Verified Sponsor]

Let's back up a bit here...

You want to monitor TDS in three locations on your system: 1) feedwater (tap water); 2) RO water; and 3) DI water. You said:

Tapwater = 235 ppm
RO = 6 ppm
DI = something higher than 0 ppm

Is this correct?

What is the pressure on the system gauge while the system is running?

Russ

 

[tom reilly]

Let's back up a bit here...

You want to monitor TDS in three locations on your system: 1) feedwater (tap water); 2) RO water; and 3) DI water. You said:

Tapwater = 235 ppm
RO = 6 ppm
DI = something higher than 0 ppm

Is this correct?

What is the pressure on the system gauge while the system is running?

Russ

House water pressure @ 50lbs. After replacing DI resin it made about 75 gals and resin dye changed from blue to brown. I shut it off when TDS reached 6.

 

[Buckeye Hydro Verified Sponsor]

Water pressure at 50 psi. OK. Good info.

Still not clear to me if the following TDS readings are correct or not:
Tapwater = 235 ppm
RO = 6 ppm
DI = something higher than 0 ppm

 

[krullshards]

The BRS folks were saying somewhere that DI resin that is exposed to air while stored would not last as long. They vacuum seal their stuff. I bought a 1.5 gallon bag that they only recommend if you are going to be making a lot of water in a relatively shorter time because once the seal is broken the DI resin life will start decreasing. At least that's what I understood from what they were saying. Was your replacement resin stored for a long period? Was it in a vacuum packed bag?

 

[haanstang]

Water pressure at 50 psi. OK. Good info.

Still not clear to me if the following TDS readings are correct or not:
Tapwater = 235 ppm
RO = 6 ppm
DI = something higher than 0 ppm

Tap = 235
Ro = 9
Di =6

Is what I gather from what he said

 

[Buckeye Hydro Verified Sponsor]

I'm not certain he understands the difference between RO and DI water... so you may be right, but maybe not. Tom - would you verify?