Diminished RODI production.....

SPotter · 04/28/2016, 07:57 AM

I have a 200 gph RODI that had been working perfectly fine 18 months until about a month ago. From the very start it was producing around 8 gph and then it dropped to 6 gph. I replaced all of the filters, new media and membranes with still no improvement. I then replaced the booster pump and that's still not helping. I am getting less than 60 psi thru the unit and cant figure out what the issue is. I reached out to the manufacturer who made a few suggestions but after contacting them again to say those suggestions didn't help, they have stopped responding to me.

So, does anyone have any suggestions?

username in use · 04/28/2016, 07:58 AM

Any of the fittings have calcium buildup that could be reducing the flow?

SPotter · 04/28/2016, 08:00 AM

Quote:

Originally Posted by username in use

Any of the fittings have calcium buildup that could be reducing the flow?

did not think to check that. I will look tonight.

joejvj · 04/28/2016, 08:31 AM

See if there are any check valves on the system. If so, one or more could have gone bad.

Also, if you haven't replaced your flow restrictor along with your new membrane, that could be the problem.

SPotter · 04/28/2016, 08:38 AM

Quote:

Originally Posted by joejvj

See if there are any check valves on the system. If so, one or more could have gone bad.

Also, if you haven't replaced your flow restrictor along with your new membrane, that could be the problem.

great suggestions too!!!!

PorkChop · 04/28/2016, 09:18 AM

If you refill DI resin, you could have also had a bead or two that made it outside the canister and into the RO tubing... that could cause a blockage also.

-Porkchop

solitude127 · 04/28/2016, 09:52 AM

What's your rejection ratio? are you running 2 membranes?

SPotter · 04/28/2016, 09:57 AM

Quote:

Originally Posted by solitude127

What's your rejection ratio? are you running 2 membranes?

I am running 2 x 100 gpd membranes. The system is supposed to be a high efficient system with a 1:1 ratio.

solitude127 · 04/28/2016, 10:13 AM

Quote:

Originally Posted by SPotter

I am running 2 x 100 gpd membranes. The system is supposed to be a high efficient system with a 1:1 ratio.

I think if you knew what the rejection ratio is, it might help troubleshoot. It might be as simple as your flow restrictor.

SPotter · 04/28/2016, 06:52 PM

so i think i narrowed it down....i have the product line split into two lines so one line goes to my topoff bin and the other to my 100g tank i used to mix saltwater. when i turn the line on for my topoff bin my pressure is over 60 psi. I turned that line off and turned the line on for my mixing tank and I am barely getting 40 psi. I will look at the float and ball valves along with look for a blockage in the line.

solitude127 · 04/29/2016, 12:08 PM

What's the length of the 2 productions lines? Could the distance of the 2 lines make a difference?

SPotter · 04/29/2016, 12:28 PM

The mixing tank is only about two more feet. It's always been that way since I set it up. Hopefully it's just the float or ball valve.

04/28/2016, 07:57 AM	#1
SPotter Registered Member Join Date: Jun 2010 Location: Mt. Pleasant, SC Posts: 5,691	Diminished RODI production..... I have a 200 gph RODI that had been working perfectly fine 18 months until about a month ago. From the very start it was producing around 8 gph and then it dropped to 6 gph. I replaced all of the filters, new media and membranes with still no improvement. I then replaced the booster pump and that's still not helping. I am getting less than 60 psi thru the unit and cant figure out what the issue is. I reached out to the manufacturer who made a few suggestions but after contacting them again to say those suggestions didn't help, they have stopped responding to me. So, does anyone have any suggestions? __________________ Steve Am I really doing all of this for a fish tank?????? Current Tank Info: 360g Envision Acrylic Tank, Closed Loops, Vectra L1's, MP40QD's, 400w Radiums, Regal 300ext, Dastaco Ext3 CaRx, Controlled by GHL Profilux

04/28/2016, 07:58 AM	#2
username in use Sciencing Daily Join Date: Mar 2009 Posts: 6,560	Any of the fittings have calcium buildup that could be reducing the flow? __________________ Joshua "With fronds like these, who needs anemones?" - Albert Einstein Current Tank Info: multiple nano's sprinkled around the house

04/28/2016, 09:52 AM	#7
solitude127 Proud user of IO Salt! Join Date: Jun 2006 Location: Torrance, CA Posts: 9,136	What's your rejection ratio? are you running 2 membranes? __________________ Mike <)))>{ <)))>{ <)))>{ <)))>{ ReefKeeping.com TOTM Nov 2012 Socalireefs Featured Reef Oct 2011 Current Tank Info: 603020, 8x54 ATI Powermodule, ReefBrite XHO, ATB Elegance 200, Aquamaxx CTech CaRx, Ecotech Vortechs, Apex Controls, WM Ecobak powered. RedSea Reefer 170, MP10, Apex Jr, Ecotech Radion XR15, Aquamaxx WS-1

04/28/2016, 06:52 PM	#10
SPotter Registered Member Join Date: Jun 2010 Location: Mt. Pleasant, SC Posts: 5,691	so i think i narrowed it down....i have the product line split into two lines so one line goes to my topoff bin and the other to my 100g tank i used to mix saltwater. when i turn the line on for my topoff bin my pressure is over 60 psi. I turned that line off and turned the line on for my mixing tank and I am barely getting 40 psi. I will look at the float and ball valves along with look for a blockage in the line. __________________ Steve Am I really doing all of this for a fish tank?????? Current Tank Info: 360g Envision Acrylic Tank, Closed Loops, Vectra L1's, MP40QD's, 400w Radiums, Regal 300ext, Dastaco Ext3 CaRx, Controlled by GHL Profilux

04/29/2016, 12:08 PM	#11
solitude127 Proud user of IO Salt! Join Date: Jun 2006 Location: Torrance, CA Posts: 9,136	What's the length of the 2 productions lines? Could the distance of the 2 lines make a difference? __________________ Mike <)))>{ <)))>{ <)))>{ <)))>{ ReefKeeping.com TOTM Nov 2012 Socalireefs Featured Reef Oct 2011 Current Tank Info: 603020, 8x54 ATI Powermodule, ReefBrite XHO, ATB Elegance 200, Aquamaxx CTech CaRx, Ecotech Vortechs, Apex Controls, WM Ecobak powered. RedSea Reefer 170, MP10, Apex Jr, Ecotech Radion XR15, Aquamaxx WS-1

04/28/2016, 08:31 AM	#4
joejvj Registered Member Join Date: Jun 2005 Location: Asheville, NC Posts: 115	See if there are any check valves on the system. If so, one or more could have gone bad. Also, if you haven't replaced your flow restrictor along with your new membrane, that could be the problem.

04/28/2016, 09:18 AM	#6
PorkChop Registered Member Join Date: Apr 2003 Location: Lexington, Ky Posts: 161	If you refill DI resin, you could have also had a bead or two that made it outside the canister and into the RO tubing... that could cause a blockage also. -Porkchop

04/29/2016, 12:28 PM	#12
SPotter Registered Member Join Date: Jun 2010 Location: Mt. Pleasant, SC Posts: 5,691	The mixing tank is only about two more feet. It's always been that way since I set it up. Hopefully it's just the float or ball valve. __________________ Steve Am I really doing all of this for a fish tank?????? Current Tank Info: 360g Envision Acrylic Tank, Closed Loops, Vectra L1's, MP40QD's, 400w Radiums, Regal 300ext, Dastaco Ext3 CaRx, Controlled by GHL Profilux