BRS Dual TDS meter ?

W.Scott · 08/26/2011, 11:03 PM

I have a BRS RO/DI system, with a dual TDS meter. My TDS reading IN is always 0, which does not seem right to me. Was I supposed to calibrate it before I installed it or something, what gives?

jimsplace · 08/27/2011, 05:39 AM

Where do you have it attached? Are you measuring it with the water flowing? It generally takes a few minuets before it will read correctly. You might want to check your installation again, if I remember the probe inside the tee has to be positioned.

mfinn · 08/27/2011, 09:03 AM

If yours is like mine that I bought from BRS, it was already installed when it came.
The TDS IN is reading the TDS of the water after it has gone through all the filters,
( carbon, sediment, ro ) and just before it goes into the DI unit.
Mine usually reads about 1.
If yours reads 0, that means the RO side is stripping all the TDS out before it hits the DI side, which can be a good thing. Makes the DI resin last a long time.

mfinn · 08/27/2011, 09:05 AM

Also, they have great product support, call them if you have a problem.

125mph · 08/27/2011, 09:08 AM

Quote:

Originally Posted by mfinn

Also, they have great product support, call them if you have a problem.

I just got my BRS 6 stage filter with cholormines .. The Dual TDS meeting shows 15 on the in and 0 on the out. Not sure why my TDS after the RO is so high???

I tested my tap water (flowing) and it has 255 TDS. That would put me at 94% reduction.. is that normal?

mfinn · 08/27/2011, 09:31 AM

Quote:

Originally Posted by 125mph

I just got my BRS 6 stage filter with cholormines .. The Dual TDS meeting shows 15 on the in and 0 on the out. Not sure why my TDS after the RO is so high???

I tested my tap water (flowing) and it has 255 TDS. That would put me at 94% reduction.. is that normal?

My tap water is usually between 35 and 50, so that might explain my lower TDS after the RO and before the DI unit.

It all depends on your tap water TDS.

Mike31154 · 08/27/2011, 09:50 AM

Membrane performance varies slightly and the lower volume/rate membranes typically have a better rejection rate than the faster producing ones such as 150s. Water pressure & temperature will also affect performance. My 75 gpd membrane gets the RO down to 1 and even 0 with tap source TDS in the 210 to 230 range. Every time I start up the system I monitor the IN TDS and it initially starts at just under 200, taking a good minute to slowly get down to 1. After running for about 10 minutes it generally gets down to 0. This is one reason I produce a few gallons of RO water for drinking purposes before switching to DI water production. I'm still on the same membrane & DI media after more than two years and thousands of gallons throughput. Something else I've noticed is that every time after I do a manual flush, there's a slight peak in RO TDS once I go back to normal operation. So be aware that although frequent flushing may be good for the membrane and speed up production, it will also make your DI work just a little harder and use it up faster.

125mph · 08/27/2011, 10:40 AM

If tds out of di says 0, then I can be certain there are no chloromines?

jimsplace · 08/27/2011, 02:10 PM

I think chloromine could make it through the membrane, thats why you need a good carbon block (made for chloromines). It should be absorbed in the DI but will shorten the life.

W.Scott · 08/27/2011, 07:41 PM

Thanks for all of the input. Should I be reading my meter with the water flowing or sitting in the line?

jimsplace · 08/28/2011, 05:04 AM

Water must be flowing to get an accurate reading. Also, let your unit run for a little while before checking.

Buckeye Hydro · 08/28/2011, 05:07 AM

Quote:

Originally Posted by Mike31154

Membrane performance varies slightly and the lower volume/rate membranes typically have a better rejection rate than the faster producing ones such as 150s.

Here are the specs for our membranes:

Russ

Buckeye Hydro · 08/28/2011, 05:11 AM

Quote:

Originally Posted by jimsplace

I think chloromine could make it through the membrane, thats why you need a good carbon block (made for chloromines). It should be absorbed in the DI but will shorten the life.

Chloramines are split back into chlorine and ammonia by the carbon block. Much or the ammonia makes its way past the membrane and is captured by the DI resin.

Russ

Piper27 · 08/28/2011, 06:35 AM

I got one from BRS and it came NOT calibrated. Said it would so I was running everywhere trying to figure out my filter situation, so I bought all new filters and other stuff when really everything was fine. Called BRS and they said call HM digital. HM digital gave me the run around and said I need to order calibration fluid. They said how do you KNOW it was not calibrated? Well because I tested the water with 3 different testers after I figured out it was your meter. Still they want me to buy the calibration fluid before I send it in to them. Crazy...

Mike31154 · 09/06/2011, 09:02 AM

Quote:

Originally Posted by BuckeyeFS

Here are the specs for our membranes:

Russ

My bad quoting the 150 as lower rejection rate. Out of curiosity though, is the 150 on your chart a single membrane or two 75s in series? Thanks.

Buckeye Hydro · 09/06/2011, 12:54 PM

Single membrane - same size as the others.

Russ

08/26/2011, 11:03 PM	#1
W.Scott Registered Member Join Date: Nov 2010 Location: Sacramento, Ca Posts: 24	BRS Dual TDS meter ? I have a BRS RO/DI system, with a dual TDS meter. My TDS reading IN is always 0, which does not seem right to me. Was I supposed to calibrate it before I installed it or something, what gives?

08/27/2011, 05:39 AM	#2
jimsplace Registered Member Join Date: Mar 2009 Location: Houston, Tx Posts: 633	Where do you have it attached? Are you measuring it with the water flowing? It generally takes a few minuets before it will read correctly. You might want to check your installation again, if I remember the probe inside the tee has to be positioned. __________________ Jim Current Tank Information; - 90 Gallon DT / 30 Gallon Sump - SPS Dominate - IC VHO Lighting

08/27/2011, 09:03 AM	#3
mfinn Registered Member Join Date: Apr 2002 Location: Olympia. WA. Posts: 8,648	If yours is like mine that I bought from BRS, it was already installed when it came. The TDS IN is reading the TDS of the water after it has gone through all the filters, ( carbon, sediment, ro ) and just before it goes into the DI unit. Mine usually reads about 1. If yours reads 0, that means the RO side is stripping all the TDS out before it hits the DI side, which can be a good thing. Makes the DI resin last a long time. __________________ 240 gallon soft coral tank 50 gallon lps tank

08/27/2011, 09:05 AM	#4
mfinn Registered Member Join Date: Apr 2002 Location: Olympia. WA. Posts: 8,648	Also, they have great product support, call them if you have a problem. __________________ 240 gallon soft coral tank 50 gallon lps tank

08/27/2011, 09:50 AM	#7
Mike31154 Registered Member Join Date: Apr 2008 Location: B.C. Canada Posts: 1,555	Membrane performance varies slightly and the lower volume/rate membranes typically have a better rejection rate than the faster producing ones such as 150s. Water pressure & temperature will also affect performance. My 75 gpd membrane gets the RO down to 1 and even 0 with tap source TDS in the 210 to 230 range. Every time I start up the system I monitor the IN TDS and it initially starts at just under 200, taking a good minute to slowly get down to 1. After running for about 10 minutes it generally gets down to 0. This is one reason I produce a few gallons of RO water for drinking purposes before switching to DI water production. I'm still on the same membrane & DI media after more than two years and thousands of gallons throughput. Something else I've noticed is that every time after I do a manual flush, there's a slight peak in RO TDS once I go back to normal operation. So be aware that although frequent flushing may be good for the membrane and speed up production, it will also make your DI work just a little harder and use it up faster. __________________ Mike Current Tank Info: 77g sumpless sw with rock, sand, a few critters, fishes & polyps. Lights, pumps..... Last edited by Mike31154; 08/27/2011 at 09:56 AM.

08/27/2011, 10:40 AM	#8
125mph Registered Member Join Date: Apr 2011 Location: San Diego, CA Posts: 1,405	If tds out of di says 0, then I can be certain there are no chloromines? __________________ 180G Rimless Starphire 72x24x24 (Miracles) 3 x Ecotech XR15w G4 Pro \| T5 x 4 \| 2 x Mp40wQD GEO 612 Cal Reactor \| Vertex Omega 150 Skimmer \| Chaeto Reactor Synergy Reef CL44 Sump \| Neptune Apex

08/27/2011, 02:10 PM	#9
jimsplace Registered Member Join Date: Mar 2009 Location: Houston, Tx Posts: 633	I think chloromine could make it through the membrane, thats why you need a good carbon block (made for chloromines). It should be absorbed in the DI but will shorten the life. __________________ Jim Current Tank Information; - 90 Gallon DT / 30 Gallon Sump - SPS Dominate - IC VHO Lighting

08/27/2011, 07:41 PM	#10
W.Scott Registered Member Join Date: Nov 2010 Location: Sacramento, Ca Posts: 24	Thanks for all of the input. Should I be reading my meter with the water flowing or sitting in the line?

08/28/2011, 05:04 AM	#11
jimsplace Registered Member Join Date: Mar 2009 Location: Houston, Tx Posts: 633	Water must be flowing to get an accurate reading. Also, let your unit run for a little while before checking. __________________ Jim Current Tank Information; - 90 Gallon DT / 30 Gallon Sump - SPS Dominate - IC VHO Lighting

08/28/2011, 06:35 AM	#14
Piper27 I love bengals Join Date: Feb 2011 Location: Manassas Virginia Posts: 2,512	I got one from BRS and it came NOT calibrated. Said it would so I was running everywhere trying to figure out my filter situation, so I bought all new filters and other stuff when really everything was fine. Called BRS and they said call HM digital. HM digital gave me the run around and said I need to order calibration fluid. They said how do you KNOW it was not calibrated? Well because I tested the water with 3 different testers after I figured out it was your meter. Still they want me to buy the calibration fluid before I send it in to them. Crazy...

09/06/2011, 12:54 PM	#16
Buckeye Hydro .Registered Member Join Date: Sep 2006 Location: Cincinnati, Ohio Posts: 4,857	Single membrane - same size as the others. Russ

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
EXTREME TYPHOON III 150 GPD RODI with Gauge & TDS Alarm & Dual TDS Meter For Sale	NONNA58	Tampa Bay Reef Club	13	11/16/2011 02:47 PM
TDS Meter	thercwizard	Saint Louis Area Saltwater Hobbyists (SLASH)	6	11/08/2010 09:14 AM
WTB: 36" T5 Fixture and TDS Meter	kobett	Southern California Reefers	6	04/24/2010 12:30 PM