RO/DI removal of Chloramines?

CW from the OC · 06/16/2006, 09:10 AM

I recall reading somewhere that the carbon blocks in a typical 4 stage RO/DI unit may not remove all chloramines from water.

Anyone else heard this?

Would it be wise to add another canister to my RO/DI, so I can run the water through 2 carbon blocks?

pnosko · 06/16/2006, 08:06 PM

Yes, GAC and carbon blocks are not effective on chloramines. Add another canister with one of the following.

10 inch catalytic carbon filter

Quote:

10 inch catalytic carbon filter in a refillable cartridge. This filter is intended to be used in water conditions where chloramines are present.

AZDesertRat · 06/16/2006, 08:27 PM

You don't need to add an additional canister, just install a refillable catalytic carbon cartridge in place of the first carbon and make sure your second carbon block is a 1 or even 0.6 micron block so it can catch any fines the granular catalytic may produce.

CW from the OC · 06/16/2006, 09:12 PM

I knew I heard that somewhere!

When I said 4 stage, I meant 4 including the RO membrane (so only one sediment, one carbon, and one DI ).

So it sounds like I should have a Cat. Carbon cartridge, then a 1 micron carbon block? That would mean I would have water flow through the sediment filter, then Cat. Carbon, then carbon block, then RO membrane, then DI?

Thanks for the help guys!

sjm817 · 06/16/2006, 09:17 PM

Byran @ purelyh2o prefers sediment->carbon block->catalytic carbon

AZDesertRat · 06/16/2006, 09:58 PM

Catalytic carbon just like all GAC can produce dust or fines over time. You are better off having something to filter those out so they do not get passed on the the membrane. Some even use another 1 micron prefilter after and granular media, I would use the carbon block afterwards myself. Anything to protect the membrane.

purelyh2o · 06/17/2006, 10:44 AM

The Chloramines will be removed.
I just prefer to keep the Cat all the way at the end because it has a tendency to clog the carbon block. Not an entirely common occurance but it has happened on several occasions. The membrane can clean itself and with the flush feature it seems to work better with less chance of clogging anything

Just my 2 cents

vessxpress1 · 06/17/2006, 11:00 AM

I'm going to be hooking up my Typhoon III today. So it can't take Chloramines out of the water?

AZDesertRat · 06/17/2006, 12:30 PM

Do you have chloramines in your water? Chloramination is not all that common yet so if your utility is not doing it its of no concern. If you do have chloramines just exchange one of the carbon blocks for a refillable catalytic carbon cartridge.

freddie40 · 06/17/2006, 12:35 PM

At what level do you need a Chloramine filter. The city water I use has 1ppm, whereas EPA recommends under 4ppm. At 1 ppm do I need a chloramine filter.

Dave

06/16/2006, 09:10 AM	#1
CW from the OC Registered Member Join Date: Jan 2006 Posts: 853	RO/DI removal of Chloramines? I recall reading somewhere that the carbon blocks in a typical 4 stage RO/DI unit may not remove all chloramines from water. Anyone else heard this? Would it be wise to add another canister to my RO/DI, so I can run the water through 2 carbon blocks? __________________ Cheers! C Dub Current Tank Info: 210 LeeMar starfire reef (7x2x2), 100 gal SoCalCreations sump, Aquacontroller 3, Geo 618 fed by Cole Parmer peri pump, ATB Large Cone , Aquatinics Constellation T5, 4 Vortecs with wireless controllers, Eheim 1262 return on a SeaSwirl

06/16/2006, 09:12 PM	#4
CW from the OC Registered Member Join Date: Jan 2006 Posts: 853	I knew I heard that somewhere! When I said 4 stage, I meant 4 including the RO membrane (so only one sediment, one carbon, and one DI ). So it sounds like I should have a Cat. Carbon cartridge, then a 1 micron carbon block? That would mean I would have water flow through the sediment filter, then Cat. Carbon, then carbon block, then RO membrane, then DI? Thanks for the help guys! __________________ Cheers! C Dub Current Tank Info: 210 LeeMar starfire reef (7x2x2), 100 gal SoCalCreations sump, Aquacontroller 3, Geo 618 fed by Cole Parmer peri pump, ATB Large Cone , Aquatinics Constellation T5, 4 Vortecs with wireless controllers, Eheim 1262 return on a SeaSwirl

06/16/2006, 09:17 PM	#5
sjm817 On Yer left! Join Date: Sep 2004 Location: Northern VA Posts: 18,777	Byran @ purelyh2o prefers sediment->carbon block->catalytic carbon __________________ - Scott

06/17/2006, 10:44 AM	#7
purelyh2o Registered Member Join Date: Oct 2005 Location: Altamonte Springs, FL Posts: 454	Either way :) The Chloramines will be removed. I just prefer to keep the Cat all the way at the end because it has a tendency to clog the carbon block. Not an entirely common occurance but it has happened on several occasions. The membrane can clean itself and with the flush feature it seems to work better with less chance of clogging anything Just my 2 cents

06/17/2006, 12:35 PM	#10
freddie40 Registered Member Join Date: Mar 2003 Location: Aurora, Co Posts: 1,415	At what level do you need a Chloramine filter. The city water I use has 1ppm, whereas EPA recommends under 4ppm. At 1 ppm do I need a chloramine filter. Dave __________________ At D.A.R.C. we are all Premium Members. Current Tank Info: 75gal with T5 lighting and 29gal Biocube with LED lighting

06/16/2006, 08:27 PM	#3
AZDesertRat Moved On Join Date: Jan 2002 Location: NW Phoenix Posts: 16,621	You don't need to add an additional canister, just install a refillable catalytic carbon cartridge in place of the first carbon and make sure your second carbon block is a 1 or even 0.6 micron block so it can catch any fines the granular catalytic may produce.

06/16/2006, 09:58 PM	#6
AZDesertRat Moved On Join Date: Jan 2002 Location: NW Phoenix Posts: 16,621	Catalytic carbon just like all GAC can produce dust or fines over time. You are better off having something to filter those out so they do not get passed on the the membrane. Some even use another 1 micron prefilter after and granular media, I would use the carbon block afterwards myself. Anything to protect the membrane.

06/17/2006, 11:00 AM	#8
vessxpress1 Premium Member Join Date: Aug 2005 Location: NW IL Posts: 1,603	I'm going to be hooking up my Typhoon III today. So it can't take Chloramines out of the water?

06/17/2006, 12:30 PM	#9
AZDesertRat Moved On Join Date: Jan 2002 Location: NW Phoenix Posts: 16,621	Do you have chloramines in your water? Chloramination is not all that common yet so if your utility is not doing it its of no concern. If you do have chloramines just exchange one of the carbon blocks for a refillable catalytic carbon cartridge.