RO/DI Unit

greenstarman · 10/14/2006, 11:48 AM

I am looking for a RO/DI unit approx. 75 gallons a day. Hopefully for under $150. Any ideas?

AZDesertRat · 10/14/2006, 12:34 PM

www.thefilterguys.biz - OceanWave+
www.purelyh20.com - Optima Vision or Optima Automated
www.buckeyefieldsupply.com - Premium Series 75 GPD
www.airwaterice.com - Typhoon

greenstarman · 10/14/2006, 08:13 PM

Currently I have a 24 gallon per day unit, a simple Kent Marine RO unit. If I bought a 75GPD and a line pressure of 60PSI will I get 75 GPD?

AZDesertRat · 10/14/2006, 09:34 PM

Depending on water temperature is entirely possible. Here is a link to Dow Filmtecs graphs showing the effects of pressure and temperature on RO output.

http://www.dow.com/PublishedLiteratu...romPage=GetDoc

Thefilterguys · 10/14/2006, 10:21 PM

Quote:

Originally posted by greenstarman
Currently I have a 24 gallon per day unit, a simple Kent Marine RO unit. If I bought a 75GPD and a line pressure of 60PSI will I get 75 GPD?

At 60 psi and with 77 degree tap water you may get close but it's not a for sure thing. With 80 psi and water temps in the 70's I was still only able to get 60 GPD. If you get a new membrane be sure it is a Filmtec as you will get your best performance for that brand.

Jim

greenstarman · 10/15/2006, 07:01 AM

How can a person get 77 degree water if they plumb their filter in with the cold water line?

Thefilterguys · 10/15/2006, 07:45 AM

You can make a mixer valve but have to be very careful you don't cook your membrane. Hot water will make quick work of your membrane and is a danger.

Jim

greenstarman · 10/15/2006, 08:08 AM

Thats what I figured... Thanks Jim

AZDesertRat · 10/15/2006, 10:57 AM

Thats probably one of the few advantages to living in Phoenix. My water temp varied between 78.1 and 80.2 yesterday when I was making water. Between the heat and the fact they bury our water services pretty shallow since there is no frost line we get pretty warm water. I suppose its not so good in the summer though as you can't take a cold shower!

Thefilterguys · 10/15/2006, 03:18 PM

We had very warm tap water temps this year but are already down to 58 degrees and go down to the fortys by winter.

Jim

AZDesertRat · 10/15/2006, 04:36 PM

Believe it or not our coldest water temps are actually in the summer when they switch the outlet from Lake Pleasant, our local impoundment, to the bottom outlets for better water quality. I have seen temps drop to the mid 50's at that time. Otherwise its in the 70's most of the year.

10/14/2006, 11:48 AM	#1
greenstarman Registered Member Join Date: Jan 2005 Location: Indiana Posts: 435	RO/DI Unit I am looking for a RO/DI unit approx. 75 gallons a day. Hopefully for under $150. Any ideas?

10/15/2006, 07:45 AM	#7
Thefilterguys RC Sponsor Join Date: Aug 2006 Location: Duluth, Mn Posts: 553	You can make a mixer valve but have to be very careful you don't cook your membrane. Hot water will make quick work of your membrane and is a danger. Jim __________________ RO/DI Supplies & parts www.thefilterguys.biz We Custom Build Each System Phone 218 724-8000 Current Tank Info: 40 OCEANIC STRETCH HEX FRESH HEAVY PLANTED, 58 OCEANIC LPS, Monti’s ,Softy’s, 18 Nano Zoo’s , 11 Nano, 70 OCEANIC SPS New 200 Cube on the way

10/15/2006, 03:18 PM	#10
Thefilterguys RC Sponsor Join Date: Aug 2006 Location: Duluth, Mn Posts: 553	We had very warm tap water temps this year but are already down to 58 degrees and go down to the fortys by winter. Jim __________________ RO/DI Supplies & parts www.thefilterguys.biz We Custom Build Each System Phone 218 724-8000 Current Tank Info: 40 OCEANIC STRETCH HEX FRESH HEAVY PLANTED, 58 OCEANIC LPS, Monti’s ,Softy’s, 18 Nano Zoo’s , 11 Nano, 70 OCEANIC SPS New 200 Cube on the way

10/14/2006, 12:34 PM	#2
AZDesertRat Moved On Join Date: Jan 2002 Location: NW Phoenix Posts: 16,621	www.thefilterguys.biz - OceanWave+ www.purelyh20.com - Optima Vision or Optima Automated www.buckeyefieldsupply.com - Premium Series 75 GPD www.airwaterice.com - Typhoon

10/14/2006, 08:13 PM	#3
greenstarman Registered Member Join Date: Jan 2005 Location: Indiana Posts: 435	Currently I have a 24 gallon per day unit, a simple Kent Marine RO unit. If I bought a 75GPD and a line pressure of 60PSI will I get 75 GPD?

10/14/2006, 09:34 PM	#4
AZDesertRat Moved On Join Date: Jan 2002 Location: NW Phoenix Posts: 16,621	Depending on water temperature is entirely possible. Here is a link to Dow Filmtecs graphs showing the effects of pressure and temperature on RO output. http://www.dow.com/PublishedLiteratu...romPage=GetDoc

10/15/2006, 07:01 AM	#6
greenstarman Registered Member Join Date: Jan 2005 Location: Indiana Posts: 435	How can a person get 77 degree water if they plumb their filter in with the cold water line?

10/15/2006, 08:08 AM	#8
greenstarman Registered Member Join Date: Jan 2005 Location: Indiana Posts: 435	Thats what I figured... Thanks Jim

10/15/2006, 10:57 AM	#9
AZDesertRat Moved On Join Date: Jan 2002 Location: NW Phoenix Posts: 16,621	Thats probably one of the few advantages to living in Phoenix. My water temp varied between 78.1 and 80.2 yesterday when I was making water. Between the heat and the fact they bury our water services pretty shallow since there is no frost line we get pretty warm water. I suppose its not so good in the summer though as you can't take a cold shower!

10/15/2006, 04:36 PM	#11
AZDesertRat Moved On Join Date: Jan 2002 Location: NW Phoenix Posts: 16,621	Believe it or not our coldest water temps are actually in the summer when they switch the outlet from Lake Pleasant, our local impoundment, to the bottom outlets for better water quality. I have seen temps drop to the mid 50's at that time. Otherwise its in the 70's most of the year.