Rodi question

cpballer · 02/20/2017, 01:24 AM

I have an rodi unit for drinking(ro) and for my fish(rodi). My water goes to a polishing filter(for odor and taste) afyer the ro membrane then goes to a 3gallon pressurize tank. I also connected a line that goes to my di resin cartridge(wihout any pressure from tank as i installed a one way valve. My question is it ok for fish water to go through the polishing filter then di? Thanks

Opus123 · 02/20/2017, 02:56 AM

No, you should not put the polishing filter before the DI. Most polishing filters add things back to the water (certain minerals) which the DI will then remove. This will cause your DI to be used up more quickly.

cpballer · 02/21/2017, 09:09 AM

Chris from brs said its ok. Anyome else have experience with this? Anyone else use their ro unit for drinking and for aquarium water

mcgyvr · 02/21/2017, 09:19 AM

Typically the "polishing" filter would be after the T so that "unpolished" water goes to the DI..

See here..
https://airwaterice.com/media/pdf_fi...lustration.pdf

Opus123 · 02/21/2017, 10:19 AM

Quote:

Originally Posted by cpballer

Chris from brs said its ok. Anyome else have experience with this? Anyone else use their ro unit for drinking and for aquarium water

You can do it, but since it is adding things back to the RO water, this will mean the DI will just have to then remove it which will cause your DI to be used up much quicker, ie cost you more money. This is just from what I've read so no personal experience. How much quicker I unfortunately have no idea. Why don't you take a TDS reading before and after the polishing filter. If it is the same then maybe it isn't really adding back enough to worry about.

mcgyvr · 02/21/2017, 11:27 AM

I don't think a "polishing" filter adds anything back..
Its simply just another carbon stage

Opus123 · 02/21/2017, 11:56 AM

Quote:

Originally Posted by mcgyvr

I don't think a "polishing" filter adds anything back..
Its simply just another carbon stage

Of course I can't find it now, but I read one article that stated some polishing filters actually added back minerals to enhance the taste since most people are not used to drinking pure water and think it tastes weird. If the filter is just a carbon based filter then it won't add anything back and should be fine to use before the di filter.

mcgyvr · 02/21/2017, 02:49 PM

Quote:

Originally Posted by Opus123

Of course I can't find it now, but I read one article that stated some polishing filters actually added back minerals to enhance the taste since most people are not used to drinking pure water and think it tastes weird. If the filter is just a carbon based filter then it won't add anything back and should be fine to use before the di filter.

In the professional bottled water process minerals are added back..
(Sodium Bicarbonate, etc...) for "taste"

Never seen a consumer level product that does so though.. Certainly could be..
But most "taste/odor" filters are just carbon blocks of one form or another.. coconut,etc..

cpballer · 02/21/2017, 03:36 PM

Quote:

Originally Posted by mcgyvr

In the professional bottled water process minerals are added back..
(Sodium Bicarbonate, etc...) for "taste"

Never seen a consumer level product that does so though.. Certainly could be..
But most "taste/odor" filters are just carbon blocks of one form or another.. coconut,etc..

So it ahould be ok not to put a t valve?. This is the polisher i havehttps://www.aquasafecanada.com/products/post-carbon-polishing-filter.html

Opus123 · 02/21/2017, 04:05 PM

That one should be fine, says it is just a carbon filters.

Side note, I find it funny one of the reviewers praises the system for taking his tds from 155 to 11.

mcgyvr · 02/21/2017, 04:20 PM

Quote:

Originally Posted by cpballer

So it ahould be ok not to put a t valve?. This is the polisher i havehttps://www.aquasafecanada.com/products/post-carbon-polishing-filter.html

Yeah.. Its ok to not...
But its also a simple 20 second fix to run it per the diagram I posted above..

cpballer · 03/29/2017, 11:55 PM

Quote:

Originally Posted by mcgyvr

Typically the "polishing" filter would be after the T so that "unpolished" water goes to the DI..

See here..
https://airwaterice.com/media/pdf_fi...lustration.pdf

In that diagram can i put the check valve on the tubing going into the pressure tank instead? Thanks

mcgyvr · 03/30/2017, 05:25 AM

Quote:

Originally Posted by cpballer

In that diagram can i put the check valve on the tubing going into the pressure tank instead? Thanks

yes you can

cpballer · 03/30/2017, 06:28 AM

Quote:

Originally Posted by mcgyvr

yes you can

Then i can add a T on the tubing going to the di to prevent tds creep right?

mcgyvr · 03/30/2017, 10:22 AM

Quote:

Originally Posted by cpballer

Then i can add a T on the tubing going to the di to prevent tds creep right?

Well a T and some valves to create your own bypass valve.. A "T" alone won't cut it..

02/20/2017, 01:24 AM	#1
cpballer Registered Member Join Date: Sep 2014 Posts: 54	Rodi question I have an rodi unit for drinking(ro) and for my fish(rodi). My water goes to a polishing filter(for odor and taste) afyer the ro membrane then goes to a 3gallon pressurize tank. I also connected a line that goes to my di resin cartridge(wihout any pressure from tank as i installed a one way valve. My question is it ok for fish water to go through the polishing filter then di? Thanks

02/21/2017, 09:19 AM	#4
mcgyvr Registered Member Join Date: Sep 2003 Location: North Carolina Posts: 20,050	Typically the "polishing" filter would be after the T so that "unpolished" water goes to the DI.. See here.. https://airwaterice.com/media/pdf_fi...lustration.pdf __________________ Who me?

02/21/2017, 11:27 AM	#6
mcgyvr Registered Member Join Date: Sep 2003 Location: North Carolina Posts: 20,050	I don't think a "polishing" filter adds anything back.. Its simply just another carbon stage __________________ Who me?

02/20/2017, 02:56 AM	#2
Opus123 Registered Member Join Date: Jul 2005 Location: North Texas Posts: 605	No, you should not put the polishing filter before the DI. Most polishing filters add things back to the water (certain minerals) which the DI will then remove. This will cause your DI to be used up more quickly.

02/21/2017, 09:09 AM	#3
cpballer Registered Member Join Date: Sep 2014 Posts: 54	Chris from brs said its ok. Anyome else have experience with this? Anyone else use their ro unit for drinking and for aquarium water

02/21/2017, 04:05 PM	#10
Opus123 Registered Member Join Date: Jul 2005 Location: North Texas Posts: 605	That one should be fine, says it is just a carbon filters. Side note, I find it funny one of the reviewers praises the system for taking his tds from 155 to 11.