Rodi brand new filters but still getting a high reading on a Dual inline TDS METER

FLSharkvictim · 11/12/2016, 11:15 AM

Have a question for ya! I just changed all of my filters on my RODI, i have a sediment filter, 2 Carbon filters, DI and a membrane...I hooked up my Dual Inline TDS Meter with the Inline before it hits the membrane and my reading is 23 and 43 for the outline after it goes through the DI into my tank. How is this possible? It's normally always zero after coming out of the DI.. What are your thoughts especially since all the filters are BRAND NEW?

tank info
120 Mixed Reef
Ecotech M1 pump
Skimz 163 DC Montzer Series skimmer
Custom sump / Refuge
2 Maxspect Gyre XF130's Pumps
2 AI Hydra TwentySix HD LED Fixtures
Celestial C35W Maxspect Refuge Spotlight
Aqua UV Ultraviolet Sterilizer 25w
BRS Dual Media reactor
Eshoops IV Master & Slave Doser
Tunze 3155 Auto Top Off

kurt_n · 11/12/2016, 11:13 PM

You replaced the filters, but is the DI resin new? If not, might want to change it out and see if that doesn't help. When DI resin is depleted, it can actually leach contaminants back into your water making it worse than it was going in.

Opus123 · 11/13/2016, 01:09 AM

If your water is really 23 before the RO membrane then you should get around 4500/gal of water or more out of your DI filter. First I don't find inline meters to be very reliable. Handheld is the way to go IMO. If the reading is true then you have a DI issue. As the above poster asked, did you change out he DI resin? If not, it may be all used up and leaching out stuff.
When you get new filters you really should run each one separately for a few gallons to get any of the junk left over from the manufacturing process out of them. Of course, don't run pure water thru the DI or you will use it up quick, just run a few gallons of RO water thru it.
Did you change out your RO membrane also? If you did, make sure it is working correctly. Get a tds reading after the membrane and before the DI filter. If your water is really 23 then your reading after the membrane should be around 1.

Buckeye Hydro · 11/13/2016, 03:26 AM

Did you follow a rinse up procedure with each of the new filters?

After the rinse up process, did you allow the system to run long enough to get past the TDS creep water before you took your reading?

Do you have the TDS meter probes correctly rotated in the quick connect tee's?

Russ

aquaman67 · 11/13/2016, 08:26 AM

Quote:

Originally Posted by Buckeye Hydro

Did you follow a rinse up procedure with each of the new filters?

After the rinse up process, did you allow the system to run long enough to get past the TDS creep water before you took your reading?

Do you have the TDS meter probes correctly rotated in the quick connect tee's?

Russ

Which way is correct?

Buckeye Hydro · 11/13/2016, 08:51 AM

Are you asking about the probes? Check your instructions and you'll see this little diagram:

Russ

11/12/2016, 11:15 AM	#1
FLSharkvictim Registered Member Join Date: Jun 2012 Location: Tampabay - FLORIDA Posts: 240	Rodi brand new filters but still getting a high reading on a Dual inline TDS METER Have a question for ya! I just changed all of my filters on my RODI, i have a sediment filter, 2 Carbon filters, DI and a membrane...I hooked up my Dual Inline TDS Meter with the Inline before it hits the membrane and my reading is 23 and 43 for the outline after it goes through the DI into my tank. How is this possible? It's normally always zero after coming out of the DI.. What are your thoughts especially since all the filters are BRAND NEW? *tank info* 120 Mixed Reef Ecotech M1 pump Skimz 163 DC Montzer Series skimmer Custom sump / Refuge 2 Maxspect Gyre XF130's Pumps 2 AI Hydra TwentySix HD LED Fixtures Celestial C35W Maxspect Refuge Spotlight Aqua UV Ultraviolet Sterilizer 25w BRS Dual Media reactor Eshoops IV Master & Slave Doser Tunze 3155 Auto Top Off

11/12/2016, 11:13 PM	#2
kurt_n Registered Member Join Date: May 2006 Location: WA Posts: 2,592	You replaced the filters, but is the DI resin new? If not, might want to change it out and see if that doesn't help. When DI resin is depleted, it can actually leach contaminants back into your water making it worse than it was going in.

11/13/2016, 01:09 AM	#3
Opus123 Registered Member Join Date: Jul 2005 Location: North Texas Posts: 605	If your water is really 23 before the RO membrane then you should get around 4500/gal of water or more out of your DI filter. First I don't find inline meters to be very reliable. Handheld is the way to go IMO. If the reading is true then you have a DI issue. As the above poster asked, did you change out he DI resin? If not, it may be all used up and leaching out stuff. When you get new filters you really should run each one separately for a few gallons to get any of the junk left over from the manufacturing process out of them. Of course, don't run pure water thru the DI or you will use it up quick, just run a few gallons of RO water thru it. Did you change out your RO membrane also? If you did, make sure it is working correctly. Get a tds reading after the membrane and before the DI filter. If your water is really 23 then your reading after the membrane should be around 1.

11/13/2016, 03:26 AM	#4
Buckeye Hydro .Registered Member Join Date: Sep 2006 Location: Cincinnati, Ohio Posts: 4,857	Did you follow a rinse up procedure with each of the new filters? After the rinse up process, did you allow the system to run long enough to get past the TDS creep water before you took your reading? Do you have the TDS meter probes correctly rotated in the quick connect tee's? Russ

11/13/2016, 08:51 AM	#6
Buckeye Hydro .Registered Member Join Date: Sep 2006 Location: Cincinnati, Ohio Posts: 4,857	Are you asking about the probes? Check your instructions and you'll see this little diagram: Russ