RO/DI Question

dbdisok · 09/05/2019, 10:21 PM

Just replaced my DI cartridge and am seeing TDS OF 002ppm. I’ve run several gallons through the new DI cartridge and can’t get the TDS to zero.

The TDS from my RO unit is 001.

Should I waste more water rinsing the DI cartridge or return it?

Goober06 · 09/05/2019, 11:02 PM

Try cleaning your sensor first. The one that shows .02ppm

Rafty · 09/06/2019, 03:10 AM

Surely a TDS of 2 is acceptable. I just change carbon filters, pre filters, membrane and RO resin and getting a TDS of 2.

Sent from my iPad using Tapatalk

hegeh · 09/06/2019, 06:37 AM

Might be di is not good? I experienced it

Sent from my SM-G930F using Tapatalk

dbdisok · 09/06/2019, 09:26 AM

I just spoke with a rep at Marine Depot and was advised that the DI material may have dried out and that all is need is 24 hours for it to rehydrate.

I’ll have to wait and see if that is the case. This morning I started the process and watch fas the TDS coming from the DI filter rose from 006 ppm to 036 ppm that after 5 minutes slowly began to fall back to 006 ppm.

Opus123 · 09/06/2019, 09:56 AM

Which RO unit do you have? Did you get a cartridge with DI already in it or did you just buy DI resin and do it yourself?

rocklobster1 · 09/06/2019, 10:02 AM

I wouldnt worry unless it was over 5.

Rafty · 09/06/2019, 04:46 PM

Quote:

Originally Posted by rocklobster1

I wouldnt worry unless it was over 5.

I agree

Sent from my iPhone using Tapatalk

wrott · 09/07/2019, 12:24 PM

Getting 1ppm after RO is pretty impossible. Something maybe wrong w/ DTS meter.

hkgar · 09/09/2019, 01:55 PM

Quote:

Originally Posted by rocklobster1

I wouldnt worry unless it was over 5.

Why wouldn't you worry? The reason for getting to 0 is so we know that htere is nothing that is dangerous to the tank occupants.

For all you know that 5 could be copper, probably not, but some of it could very well be dangerous.

inf0r · 09/09/2019, 02:25 PM

When did you last calibrate your TDS meter? I wouldn’t trust most hobbyist level TDS meters to accurately be able to tell the difference between 0 and 1ppm.

Did you buy a pre-filled cartridge or refill a cartridge you already had? Sometimes you can get channelling in the DI resin if not properly compacted and filled.

rocklobster1 · 09/09/2019, 02:26 PM

Quote:

Originally Posted by hkgar

Why wouldn't you worry? The reason for getting to 0 is so we know that htere is nothing that is dangerous to the tank occupants.

For all you know that 5 could be copper, probably not, but some of it could very well be dangerous.

There would be a mixture of ions/elements getting through. I would say the risk is extremely minimal at 5ppm. Unless you were actually never doing water changes and just topping off for years on end with 5ppm water. Tanks much more likely to die from a myriad of other problems that plague reef tanks.

09/05/2019, 10:21 PM	#1
dbdisok Registered Member Join Date: Oct 2008 Location: Moorprak, CA Posts: 270	RO/DI Question Just replaced my DI cartridge and am seeing TDS OF 002ppm. I’ve run several gallons through the new DI cartridge and can’t get the TDS to zero. The TDS from my RO unit is 001. Should I waste more water rinsing the DI cartridge or return it? __________________ Present: 55 gallon, LR, LS, HOB skimmer, HOB filter with Chemipure bags, Current Dual Satellite Power Compacts. Established January 2008. Next up 120 gallon RR. Much planning and work to be completed. Current Tank Info: 55 gal reef with sump, L/S L/R

09/06/2019, 09:26 AM	#5
dbdisok Registered Member Join Date: Oct 2008 Location: Moorprak, CA Posts: 270	I just spoke with a rep at Marine Depot and was advised that the DI material may have dried out and that all is need is 24 hours for it to rehydrate. I’ll have to wait and see if that is the case. This morning I started the process and watch fas the TDS coming from the DI filter rose from 006 ppm to 036 ppm that after 5 minutes slowly began to fall back to 006 ppm. __________________ Present: 55 gallon, LR, LS, HOB skimmer, HOB filter with Chemipure bags, Current Dual Satellite Power Compacts. Established January 2008. Next up 120 gallon RR. Much planning and work to be completed. Current Tank Info: 55 gal reef with sump, L/S L/R

09/07/2019, 12:24 PM	#9
wrott Registered Member Join Date: Mar 2004 Location: Alabama Posts: 2,912	Getting 1ppm after RO is pretty impossible. Something maybe wrong w/ DTS meter. __________________ OK, but where does the meat go! ------------------------------------------------ 120g SPS, 125g mix, 56g FOWLR, 20g qt

09/09/2019, 02:25 PM	#11
inf0r Registered Member Join Date: Nov 2005 Posts: 3	When did you last calibrate your TDS meter? I wouldn’t trust most hobbyist level TDS meters to accurately be able to tell the difference between 0 and 1ppm. Did you buy a pre-filled cartridge or refill a cartridge you already had? Sometimes you can get channelling in the DI resin if not properly compacted and filled. __________________ My system :: http://www.ultimatereef.net/forums/showthread.php?t=654929

09/05/2019, 11:02 PM	#2
Goober06 Registered Member Join Date: Apr 2013 Posts: 35	Try cleaning your sensor first. The one that shows .02ppm

09/06/2019, 03:10 AM	#3
Rafty Registered Member Join Date: Jan 2019 Posts: 141	Surely a TDS of 2 is acceptable. I just change carbon filters, pre filters, membrane and RO resin and getting a TDS of 2. Sent from my iPad using Tapatalk

09/06/2019, 06:37 AM	#4
hegeh Registered Member Join Date: Apr 2017 Posts: 223	Might be di is not good? I experienced it Sent from my SM-G930F using Tapatalk

09/06/2019, 09:56 AM	#6
Opus123 Registered Member Join Date: Jul 2005 Location: North Texas Posts: 605	Which RO unit do you have? Did you get a cartridge with DI already in it or did you just buy DI resin and do it yourself?

09/06/2019, 10:02 AM	#7
rocklobster1 Registered Member Join Date: Feb 2018 Posts: 57	I wouldnt worry unless it was over 5.