Ro/di Tds

mhaith · 05/12/2008, 08:24 PM

I have a TDS that measures post carbon/sediment/RO that has been registering about 40-50 TDS.
I have been blowing through DI filters like every 200 gals.
What should the TDS goal be for coming out ot the RO?

HarleyDude · 05/12/2008, 08:32 PM

Sounds like your membrane isn't working properly.

sjm817 · 05/12/2008, 08:48 PM

Quote:

Originally posted by mhaith

What should the TDS goal be for coming out ot the RO?

Should be ~ 97 - 98% less than your tap water.

Buckeye Hydro · 05/13/2008, 06:13 PM

Quote:

What should the TDS goal be for coming out ot the RO? [/B]

That depends on what membrane you have, and the TDS of your tap water.

We can say that your RO TDS should be 10% or less of the TDS in your tap water.

So if you tap water reads 240 ppm, your RO water should be 24 ppm or less. If you have a high rejection membrane, target a 96 to 98% reduction.

So, what is your tap water TDS? and what brand and capacity (gpd) membrane are you using?

Russ

mhaith · 05/13/2008, 06:53 PM

Actually I solved the problem somehow by taking out the membrane and putting it back in. I wonder if it just wasn't seated right?

Buckeye Hydro · 05/13/2008, 06:59 PM

Good deal.

That's a common problem. If the membrane isn't pushed all the way in, waste water will come out of the purified water port and as you experienced, you'll end up going through your resin in no time.

Russ

mhaith · 05/13/2008, 07:01 PM

The simplest solutions....

Buckeye Hydro · 05/13/2008, 07:06 PM

Yep. The other symptom you'll see when this happens is a waste to permeate ratio that is too low.

Russ

05/12/2008, 08:24 PM	#1
mhaith Registered Member Join Date: Nov 2007 Location: Englewood, CO Posts: 649	Ro/di Tds I have a TDS that measures post carbon/sediment/RO that has been registering about 40-50 TDS. I have been blowing through DI filters like every 200 gals. What should the TDS goal be for coming out ot the RO? __________________ Michael Current Tank Info: 210 T5 SPS dom. mixed reef

05/13/2008, 06:53 PM	#5
mhaith Registered Member Join Date: Nov 2007 Location: Englewood, CO Posts: 649	Actually I solved the problem somehow by taking out the membrane and putting it back in. I wonder if it just wasn't seated right? __________________ Michael Current Tank Info: 210 T5 SPS dom. mixed reef

05/13/2008, 07:01 PM	#7
mhaith Registered Member Join Date: Nov 2007 Location: Englewood, CO Posts: 649	The simplest solutions.... __________________ Michael Current Tank Info: 210 T5 SPS dom. mixed reef

05/12/2008, 08:32 PM	#2
HarleyDude Premium Member Join Date: Apr 2006 Location: Pittsburgh, PA Posts: 59	Sounds like your membrane isn't working properly.

05/13/2008, 06:59 PM	#6
Buckeye Hydro .Registered Member Join Date: Sep 2006 Location: Cincinnati, Ohio Posts: 4,857	Good deal. That's a common problem. If the membrane isn't pushed all the way in, waste water will come out of the purified water port and as you experienced, you'll end up going through your resin in no time. Russ

05/13/2008, 07:06 PM	#8
Buckeye Hydro .Registered Member Join Date: Sep 2006 Location: Cincinnati, Ohio Posts: 4,857	Yep. The other symptom you'll see when this happens is a waste to permeate ratio that is too low. Russ