Flow Restrictor Size For 100 gpd

sharko88 · 03/20/2014, 03:40 PM

So I ordered the Dow Filmtec 100 gpd (Model: TW30-1812-100HR) membrane for my RO/DI system yesterday and need to get a flow restrictor for it. Which size should I get? I see BRS recommends an 800 for 100 gpd but other sites recommend a 1000 and Dow's site does not specify even a target ratio for me to go by.

drew2007 · 03/20/2014, 03:44 PM

A 100gpd membrane will require a 100gpd flow restrictor. BRS should have them.

http://www.bulkreefsupply.com/revers...estrictor.html

MarineDepot · 03/20/2014, 03:55 PM

The 800 numbers that you see for flow restrictors is in ml/min measurement. For the 100 GPD membrane, you will want the 100 GPD (or 800 ml/min). You don't need to go larger.

Dan

SpectraPure · 03/20/2014, 04:43 PM

Quote:

Originally Posted by MarineDepot

The 800 numbers that you see for flow restrictors is in ml/min measurement. For the 100 GPD membrane, you will want the 100 GPD (or 800 ml/min). You don't need to go larger.

Dan

Hello,

The barrel flow restrictors are obsolete. The screens inside clog up with calcium, and they do not allow the proper waste ratio over time. This leads to membrane scaling, and then in turn depletes your DI quicker.

http://spectrapure.com/AQUARIUM/MEMB...low-Restrictor

This is a much better design, and will help your system stay efficient. This one is adjustable. You can set it to 2:1, 3:1, 4:1, and 5:1. The more waste water you allow through your system, the longer your membrane and DI will last.

Not we do not recommend going over 5:1

IF you need any more help, please let me know.

Jeremy

sharko88 · 03/21/2014, 08:47 AM

Okay, so doing the math, the 800 is approximately 300 gallons per day and the 1000 is 380 gallons per day.

So my question is should I get a 1:3 ratio or a 1:4 ratio for that model membrane?

I am only making about 60 gallons of water a month for water changes and top off so wondering really how much of a difference the more constant pressure of a 1:3 will make on the overall life of the membrane.

drew2007 · 03/21/2014, 08:55 AM

Quote:

Originally Posted by sharko88

Okay, so doing the math, the 800 is approximately 300 gallons per day and the 1000 is 380 gallons per day.

So my question is should I get a 1:3 ratio or a 1:4 ratio for that model membrane?

I am only making about 60 gallons of water a month for water changes and top off so wondering really how much of a difference the more constant pressure of a 1:3 will make on the overall life of the membrane.

All you need is a 100 gallon per day flow restrictor. Forget those 800 and 1000 ml/min numbers. Find one rated for 100gpd and your good to go.

SpectraPure · 03/21/2014, 09:48 AM

When you are looking at the flow restrictors ML number, it is not referring to the product water, but it is referring to the waste water. A typical 90gpd system will do 250 ML a minute. You want at least a 500-750ML waste. I will suggest one more time, on not getting a barrel flow restrictor. It will save you ratio problems and membrane failures in the long run.

Jeremy

sharko88 · 03/21/2014, 11:33 AM

I know that the ML is the waste water. My reference to the ratios was based on 100 gpd of product water and 300 gpd (800 ml/min) of waste water which would be a 1:3 ratio. Likewise the 1000 ml/min would be 380 gallons per day of waste water which would put the ratio at 1:3.8 (closer to 1:4). Are my ratios correct?

AcroporAddict · 03/21/2014, 11:37 AM

Quote:

Originally Posted by drew2007

A 100gpd membrane will require a 100gpd flow restrictor. BRS should have them.

http://www.bulkreefsupply.com/revers...estrictor.html

This!^

SpectraPure · 03/21/2014, 11:39 AM

Yes they certainly are. Typically in the industry we use waste water first when describing the waste ratio. 3:1, 4:1 are correct.

=)

ken6217 · 03/21/2014, 12:01 PM

Quote:

Originally Posted by SpectraPure

Hello,

The barrel flow restrictors are obsolete. The screens inside clog up with calcium, and they do not allow the proper waste ratio over time. This leads to membrane scaling, and then in turn depletes your DI quicker.

http://spectrapure.com/AQUARIUM/MEMB...low-Restrictor

This is a much better design, and will help your system stay efficient. This one is adjustable. You can set it to 2:1, 3:1, 4:1, and 5:1. The more waste water you allow through your system, the longer your membrane and DI will last.

Not we do not recommend going over 5:1

IF you need any more help, please let me know.

Jeremy

I see on your sight that you do not have one for 75g per day which is what my membrane is. What do you suggest?

Thanks,
Ken

SpectraPure · 03/21/2014, 12:08 PM

The 90 gpd will work for the 75gpd. BRS tests at 50 psi, and we test at 60 psi. Essentially BRS 75 is our 90 gpd and vice versa. It's kind of like Nike and Reebok. One manufacture may say size 10 and it fits, but another may say size 10.5 and it fits.

Jeremy

03/20/2014, 03:40 PM	#1
sharko88 Registered Member Join Date: May 2007 Location: Dallas, TX Posts: 129	Flow Restrictor Size For 100 gpd So I ordered the Dow Filmtec 100 gpd (Model: TW30-1812-100HR) membrane for my RO/DI system yesterday and need to get a flow restrictor for it. Which size should I get? I see BRS recommends an 800 for 100 gpd but other sites recommend a 1000 and Dow's site does not specify even a target ratio for me to go by.

03/20/2014, 03:44 PM	#2
drew2007 Registered Member Join Date: Mar 2007 Location: Long Island, NY Posts: 976	A 100gpd membrane will require a 100gpd flow restrictor. BRS should have them. http://www.bulkreefsupply.com/revers...estrictor.html __________________ 110g rimless, Elite Aquatics sump, JNS ConeS Co2, ATI Sunpower, Vortech, Digital Aquatics RKE

03/21/2014, 09:48 AM	#7
SpectraPure RC Sponsor Join Date: Jun 2003 Posts: 0	When you are looking at the flow restrictors ML number, it is not referring to the product water, but it is referring to the waste water. A typical 90gpd system will do 250 ML a minute. You want at least a 500-750ML waste. I will suggest one more time, on not getting a barrel flow restrictor. It will save you ratio problems and membrane failures in the long run. Jeremy __________________ *Innovators in water technology.* Since 1985!

03/21/2014, 11:39 AM	#10
SpectraPure RC Sponsor Join Date: Jun 2003 Posts: 0	Yes they certainly are. Typically in the industry we use waste water first when describing the waste ratio. 3:1, 4:1 are correct. =) __________________ *Innovators in water technology.* Since 1985!

03/21/2014, 12:08 PM	#12
SpectraPure RC Sponsor Join Date: Jun 2003 Posts: 0	The 90 gpd will work for the 75gpd. BRS tests at 50 psi, and we test at 60 psi. Essentially BRS 75 is our 90 gpd and vice versa. It's kind of like Nike and Reebok. One manufacture may say size 10 and it fits, but another may say size 10.5 and it fits. Jeremy __________________ *Innovators in water technology.* Since 1985!

03/20/2014, 03:55 PM	#3
MarineDepot Sponsor Join Date: Oct 2001 Posts: 5,129	The 800 numbers that you see for flow restrictors is in ml/min measurement. For the 100 GPD membrane, you will want the 100 GPD (or 800 ml/min). You don't need to go larger. Dan

03/21/2014, 08:47 AM	#5
sharko88 Registered Member Join Date: May 2007 Location: Dallas, TX Posts: 129	Okay, so doing the math, the 800 is approximately 300 gallons per day and the 1000 is 380 gallons per day. So my question is should I get a 1:3 ratio or a 1:4 ratio for that model membrane? I am only making about 60 gallons of water a month for water changes and top off so wondering really how much of a difference the more constant pressure of a 1:3 will make on the overall life of the membrane.

03/21/2014, 11:33 AM	#8
sharko88 Registered Member Join Date: May 2007 Location: Dallas, TX Posts: 129	I know that the ML is the waste water. My reference to the ratios was based on 100 gpd of product water and 300 gpd (800 ml/min) of waste water which would be a 1:3 ratio. Likewise the 1000 ml/min would be 380 gallons per day of waste water which would put the ratio at 1:3.8 (closer to 1:4). Are my ratios correct?