TDS jumped up after changing ro filters

hyp3nitis · 03/30/2014, 04:01 PM

this is my first time changing filters in my 6 stage r/o system. its been about a year and half since I had system. it was still giving me 006 on tds meter. but I decided to change the two 10inch sediment filters and the 10inch carbon block. tds is now 030. I did not change the membrane or the di resin. but I did not think this would make tds higher by just changing filters. I flushed about 5 gallons of water threw system. im running dangerously low on r/o water. help pleeease?

this is my ro system http://www.soumiknight.com/ProductDe...ctCode=D1006CT

Laardvark · 03/31/2014, 07:37 AM

That's odd. Somebody correct me if I'm wrong, but AFAIK the pre filters don't really affect TDS, they just remove some of the things that might damage or foul the membrane.

It's a safe bet your DI resin is shot, but at 30 ppm new resin won't last long, so replacing that is pointless until you solve the bigger problem (your TDS after the tesin should be 0). The specs on that system claim a 99% membrane, so either something is really wrong with your membrane (I'm sure your input is not 3000ppm...) or this is something off-kilter with the setup.

I'd disassemble the whole thing, drain the tank, and reassemble. Get some distilled water and check the calibration of your TDS meter. If everything else checks out you might have a defective membrane.

Hope this helps.

shifty51008 · 03/31/2014, 08:20 AM

i'm guessing you don't have a flush valve to flush the membrane?

as stated the TDS shouldn't really change with the sediment and carbon, the membrane and DI containers do all the work.

what is your PSI going into the membrane?
what is the TDS readings at tap, after membrane, and after DI?
check to see if your getting a 4:1 waste to good water

also you should be changeing the sediment and carbon filters every 6 months regardless of how dirty they are due to bacteria build up.

hyp3nitis · 04/01/2014, 12:31 AM

I think it needed to be flushed more. I flushed for about 8 hours and it dropped to 007.

I ordered this resin filter

will it bring me back down to 0 tds?

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Laardvark · 04/01/2014, 07:08 AM

It should bring you down to 0.

What is your TDS going into the membrane? 7 still seems kinda high. Measure how much product you're getting vs. how much waste water. Do you know what the water pressure is going into the system?

I'm asking because every bit you drop your TDS pre-DI resin will extend the life of the resin considerably.

shifty51008 · 04/01/2014, 07:13 AM

that DI will work fine, if possiable position it so it faces up and down, not sideways like those units place them, you will get better use from it.

hyp3nitis · 04/01/2014, 02:18 PM

no I dont have a pressure meter on unit. how do I find out the tds going into membrane? I think 007 is a little high but I have never changed any of the filters in ro till year and half later. so di resin is year and half old. does this mean its all the out. causing 007 tds? my tap tds is 98tds

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tkeracer619 · 04/01/2014, 03:12 PM

Yes, your DI is shot.

Everytime you cut your tds in half your DI life doubles.

With a filmtech 75gpd membrane you should be seeing 1tds out of your RO membrane max.

With a cheapo unit that sounds about right. It will exhaust di quickly.

hyp3nitis · 04/04/2014, 03:20 AM

I got the di filter. tds is down to 001 tds. it will probably go to 000. if I let it warm up to room temp. do I need to flush the di filter before using water for a water change?

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shifty51008 · 04/04/2014, 03:42 AM

Quote:

Originally Posted by hyp3nitis

I got the di filter. tds is down to 001 tds. it will probably go to 000. if I let it warm up to room temp. do I need to flush the di filter before using water for a water change?

via galaxy noteIII 4gLTE

No need to flush the di stage.

hyp3nitis · 04/04/2014, 10:35 AM

ok guys its back at 000. thanks a million. I have made about 13 gallons of ro/di. the resin has already started to turn colors. how do I kno when it's time to replace di resin? here's a picture

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shifty51008 · 04/04/2014, 10:58 AM

don't go by the color of the resin, use a TDS meter, when it reaches 1ppm then it's time to change it out

hyp3nitis · 04/04/2014, 03:00 PM

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shifty51008 · 04/04/2014, 03:17 PM

Quote:

Originally Posted by hyp3nitis

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03/30/2014, 04:01 PM	#1
hyp3nitis Registered Member Join Date: Aug 2012 Posts: 16	TDS jumped up after changing ro filters this is my first time changing filters in my 6 stage r/o system. its been about a year and half since I had system. it was still giving me 006 on tds meter. but I decided to change the two 10inch sediment filters and the 10inch carbon block. tds is now 030. I did not change the membrane or the di resin. but I did not think this would make tds higher by just changing filters. I flushed about 5 gallons of water threw system. im running dangerously low on r/o water. help pleeease? this is my ro system http://www.soumiknight.com/ProductDe...ctCode=D1006CT

03/31/2014, 08:20 AM	#3
shifty51008 12-5 Chiefs record Join Date: Mar 2010 Location: NW Iowa Posts: 10,134	i'm guessing you don't have a flush valve to flush the membrane? as stated the TDS shouldn't really change with the sediment and carbon, the membrane and DI containers do all the work. what is your PSI going into the membrane? what is the TDS readings at tap, after membrane, and after DI? check to see if your getting a 4:1 waste to good water also you should be changeing the sediment and carbon filters every 6 months regardless of how dirty they are due to bacteria build up. __________________ 75 gal. mixed DT, 100 gal. sump, 50 gal. fuge, Clownfish breeder

04/01/2014, 12:31 AM	#4
hyp3nitis Registered Member Join Date: Aug 2012 Posts: 16	I think it needed to be flushed more. I flushed for about 8 hours and it dropped to 007. I ordered this resin filter will it bring me back down to 0 tds? via galaxy nexus 7 4gLTE Last edited by Dino; 04/01/2014 at 04:25 AM.

04/01/2014, 07:13 AM	#6
shifty51008 12-5 Chiefs record Join Date: Mar 2010 Location: NW Iowa Posts: 10,134	that DI will work fine, if possiable position it so it faces up and down, not sideways like those units place them, you will get better use from it. __________________ 75 gal. mixed DT, 100 gal. sump, 50 gal. fuge, Clownfish breeder

04/01/2014, 03:12 PM	#8
tkeracer619 Registered Member Join Date: Jan 2006 Location: Westminster, CO Posts: 17,289	Yes, your DI is shot. Everytime you cut your tds in half your DI life doubles. With a filmtech 75gpd membrane you should be seeing 1tds out of your RO membrane max. With a cheapo unit that sounds about right. It will exhaust di quickly. __________________ 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.

03/31/2014, 07:37 AM	#2
Laardvark Registered Member Join Date: Feb 2014 Location: Chapel Hill, NC Posts: 61	That's odd. Somebody correct me if I'm wrong, but AFAIK the pre filters don't really affect TDS, they just remove some of the things that might damage or foul the membrane. It's a safe bet your DI resin is shot, but at 30 ppm new resin won't last long, so replacing that is pointless until you solve the bigger problem (your TDS after the tesin should be 0). The specs on that system claim a 99% membrane, so either something is really wrong with your membrane (I'm sure your input is not 3000ppm...) or this is something off-kilter with the setup. I'd disassemble the whole thing, drain the tank, and reassemble. Get some distilled water and check the calibration of your TDS meter. If everything else checks out you might have a defective membrane. Hope this helps.

04/01/2014, 07:08 AM	#5
Laardvark Registered Member Join Date: Feb 2014 Location: Chapel Hill, NC Posts: 61	It should bring you down to 0. What is your TDS going into the membrane? 7 still seems kinda high. Measure how much product you're getting vs. how much waste water. Do you know what the water pressure is going into the system? I'm asking because every bit you drop your TDS pre-DI resin will extend the life of the resin considerably.

04/01/2014, 02:18 PM	#7
hyp3nitis Registered Member Join Date: Aug 2012 Posts: 16	no I dont have a pressure meter on unit. how do I find out the tds going into membrane? I think 007 is a little high but I have never changed any of the filters in ro till year and half later. so di resin is year and half old. does this mean its all the out. causing 007 tds? my tap tds is 98tds via galaxy nexus 7 4gLTE

04/04/2014, 03:20 AM	#9
hyp3nitis Registered Member Join Date: Aug 2012 Posts: 16	I got the di filter. tds is down to 001 tds. it will probably go to 000. if I let it warm up to room temp. do I need to flush the di filter before using water for a water change? via galaxy noteIII 4gLTE

04/04/2014, 10:35 AM	#11
hyp3nitis Registered Member Join Date: Aug 2012 Posts: 16	ok guys its back at 000. thanks a million. I have made about 13 gallons of ro/di. the resin has already started to turn colors. how do I kno when it's time to replace di resin? here's a picture via galaxy noteIII 4gLTE

04/04/2014, 10:58 AM	#12
shifty51008 12-5 Chiefs record Join Date: Mar 2010 Location: NW Iowa Posts: 10,134	don't go by the color of the resin, use a TDS meter, when it reaches 1ppm then it's time to change it out __________________ 75 gal. mixed DT, 100 gal. sump, 50 gal. fuge, Clownfish breeder

04/04/2014, 03:00 PM	#13
hyp3nitis Registered Member Join Date: Aug 2012 Posts: 16	via galaxy noteIII 4gLTE