RODI issues

Dbondaruk · 02/25/2018, 10:42 AM

Hello I have a maximma rodi unit. The unit is about 8 years old. Last time I used it was like 1 year ago which was working fine. I was living in the city with city water. I moved to new house that has well water. I hooked the unit up and made 40 gallons and 1 canister of DI is complete changed color. The other is about 1/4 ways turned color. It’s a 6 stage filter. 1 micron block. 2 carbon blocks. Ro membrane and 2 DI resin chambers. I bought all new filters and new membrane for it. Water coming out of the Tap is 450 tDS. Water after RO membrane is 27 tds. 0 after DI resin. Pressure coming into membrane is at 43 PSI. I do not know the co2 levels of the well water. Any suggestions or tips please

Bent · 02/25/2018, 11:55 AM

Membrane is trashed. Time to buy a new one.

Vinny Kreyling · 02/25/2018, 12:11 PM

With a well you Have to de -gas the water Before running through the system or you Will kill the DI.

Dbondaruk · 02/25/2018, 12:27 PM

Quote:

Originally Posted by Bent

Membrane is trashed. Time to buy a new one.

Membrane was brand new when I put it in

Dbondaruk · 02/25/2018, 12:28 PM

Quote:

Originally Posted by Vinny Kreyling

With a well you Have to de -gas the water Before running through the system or you Will kill the DI.

I will look into degassing method Thanks

Opus123 · 02/25/2018, 03:50 PM

You should also look into getting a booster pump for the RO unit. My water is over 400 tds and my water after the membrane is 4 tds. I have a 99% rejection rate membrane. Do you know the expected rejection rate of yours or have a link to what you bought?

Dbondaruk · 02/25/2018, 04:03 PM

Quote:

Originally Posted by Opus123

You should also look into getting a booster pump for the RO unit. My water is over 400 tds and my water after the membrane is 4 tds. I have a 99% rejection rate membrane. Do you know the expected rejection rate of yours or have a link to what you bought?

I got the one from BRS 75 gpd Dow one. Says 96-99 rejection rate. And yea I want to get a booster pump

Bent · 02/25/2018, 07:51 PM

Quote:

Originally Posted by Dbondaruk

Membrane was brand new when I put it in

A year ago...

What’s the pressure going right into the membrane?

It’s a pretty simple machine. If the pressure is good, the membrane is good and fully seated, tds should be 98% less than what went in it.

The high TDS going into the DI is what is exhausting the resin.

Edit:

Just noticed the pressure going in was low 40s. Should be fine with that pressure. It’s the membrane.

Dbondaruk · 02/25/2018, 08:22 PM

Quote:

Originally Posted by Bent

A year ago...

What’s the pressure going right into the membrane?

It’s a pretty simple machine. If the pressure is good, the membrane is good and fully seated, tds should be 98% less than what went in it.

The high TDS going into the DI is what is exhausting the resin.

Edit:

Just noticed the pressure going in was low 40s. Should be fine with that pressure. It’s the membrane.

No I meant the membrane is brand new. I put it in 2 days ago. Ordered it like a week ago. It’s not a year old.

Bent · 02/25/2018, 08:47 PM

Quote:

Originally Posted by Dbondaruk

No I meant the membrane is brand new. I put it in 2 days ago. Ordered it like a week ago. It’s not a year old.

Oh oh lol ok my bad

What membrane is it?

Dbondaruk · 02/25/2018, 09:02 PM

Quote:

Originally Posted by Bent

Oh oh lol ok my bad

What membrane is it?

Dow. I think I need a booster pump. It varies from 35 psi to 43

Opus123 · 02/25/2018, 10:01 PM

Quote:

Originally Posted by Dbondaruk

I got the one from BRS 75 gpd Dow one. Says 96-99 rejection rate. And yea I want to get a booster pump

Was the old membrane 75gpd also? If not, you need to get a flow restrictor to match the gpd of the new membrane.

Dbondaruk · 02/25/2018, 10:05 PM

Quote:

Originally Posted by Opus123

Was the old membrane 75gpd also? If not, you need to get a flow restrictor to match the gpd of the new membrane.

Yea the old membrane was 75gpd. The new is 75 gpd and I am using the 550 gpd flow restrictor that is recommended

Dbondaruk · 03/03/2018, 10:06 PM

So update actually installed a dual TDS meter before the DI its 15 tds after DI is 2. This is after I made about 60 gallons of water and 2 DI canisters. Any ideas what I should look into

Vinny Kreyling · 03/04/2018, 08:39 AM

DE-GASSING THE WATER
Sounds like the DI is shot already.

tkeracer619 · 03/04/2018, 11:49 PM

High CO2 will cause some issues as others have stated. There are two ways to go about it.

Put raw water in a barrel, run a large air stone, pump the water through the RODI unit with a booster pump. Or you can go through your RO system and fill a container like a rubbermaid trashcan where you degass it. Place this up high and let gravity push the RO water slowly through the DI and into another container.

You have 94% rejection, which is pretty poor. Even without CO2 that high of a TDS will eat up DI so you should probably address that issue as well. Consider a booster pump and using a needle valve instead of restricter to go to 4:1 or 5:1 and see if that helps TDS post membrane.

Dbondaruk · 03/05/2018, 11:42 PM

Thanks for the tips fellas. I will install a booster pump and than give update

02/25/2018, 10:42 AM	#1
Dbondaruk Registered Member Join Date: Dec 2012 Location: Harrisonburg,VA Posts: 706	RODI issues Hello I have a maximma rodi unit. The unit is about 8 years old. Last time I used it was like 1 year ago which was working fine. I was living in the city with city water. I moved to new house that has well water. I hooked the unit up and made 40 gallons and 1 canister of DI is complete changed color. The other is about 1/4 ways turned color. It’s a 6 stage filter. 1 micron block. 2 carbon blocks. Ro membrane and 2 DI resin chambers. I bought all new filters and new membrane for it. Water coming out of the Tap is 450 tDS. Water after RO membrane is 27 tds. 0 after DI resin. Pressure coming into membrane is at 43 PSI. I do not know the co2 levels of the well water. Any suggestions or tips please

02/25/2018, 11:55 AM	#2
Bent I got nothin' Join Date: Nov 2004 Location: The anals Posts: 6,420	Membrane is trashed. Time to buy a new one. __________________ Quitters never lose. [QUOTE=CStrickland]Who gets mad at a starfish?[/QUOTE] Current Tank Info: 75g DT, 30G refugium, 10g chaeto tank, 50g stock tank basement sump

02/25/2018, 12:11 PM	#3
Vinny Kreyling Registered Member Join Date: Nov 2002 Location: Miller Place, NY Posts: 7,206	With a well you Have to de -gas the water Before running through the system or you Will kill the DI. __________________ 250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps.

03/04/2018, 08:39 AM	#15
Vinny Kreyling Registered Member Join Date: Nov 2002 Location: Miller Place, NY Posts: 7,206	DE-GASSING THE WATER Sounds like the DI is shot already. __________________ 250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps.

03/04/2018, 11:49 PM	#16
tkeracer619 Registered Member Join Date: Jan 2006 Location: Westminster, CO Posts: 17,289	High CO2 will cause some issues as others have stated. There are two ways to go about it. Put raw water in a barrel, run a large air stone, pump the water through the RODI unit with a booster pump. Or you can go through your RO system and fill a container like a rubbermaid trashcan where you degass it. Place this up high and let gravity push the RO water slowly through the DI and into another container. You have 94% rejection, which is pretty poor. Even without CO2 that high of a TDS will eat up DI so you should probably address that issue as well. Consider a booster pump and using a needle valve instead of restricter to go to 4:1 or 5:1 and see if that helps TDS post membrane. __________________ Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers. Current Tank: Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k.

02/25/2018, 03:50 PM	#6
Opus123 Registered Member Join Date: Jul 2005 Location: North Texas Posts: 605	You should also look into getting a booster pump for the RO unit. My water is over 400 tds and my water after the membrane is 4 tds. I have a 99% rejection rate membrane. Do you know the expected rejection rate of yours or have a link to what you bought?

03/03/2018, 10:06 PM	#14
Dbondaruk Registered Member Join Date: Dec 2012 Location: Harrisonburg,VA Posts: 706	So update actually installed a dual TDS meter before the DI its 15 tds after DI is 2. This is after I made about 60 gallons of water and 2 DI canisters. Any ideas what I should look into

03/05/2018, 11:42 PM	#17
Dbondaruk Registered Member Join Date: Dec 2012 Location: Harrisonburg,VA Posts: 706	Thanks for the tips fellas. I will install a booster pump and than give update