Go Back   Aquarium Advice - Aquarium Forum Community > Saltwater and Reef > Saltwater Reef Aquaria
Click Here to Login

Join Aquarium Advice Today
Reply
 
Thread Tools Search this Thread Display Modes
Please support our sponsors and let them know you heard about them on AquariumAdvice.com
 
Old 05-17-2007, 12:27 AM   #1
Aquarium Advice Activist
 
Join Date: Mar 2006
Location: Buckeye, AZ
Posts: 177
TDS

Just wanted to find out, I was reading another post about TDS reading 90 from RO/DI unit, what I would like to find out we have very nasty water TDS's just from the tap is 240x10 and I can get my TDS down to 20 something with the RO and a inline DI filter, but after a couple of uses my TDS is up to about 120 or so.

My question is would the resin beads be better than the inline DI filter, or should I consider useing 2 DI filters or any other suggestions? TIA
__________________

__________________
SassyAngel111 is offline   Reply With Quote
Old 05-17-2007, 08:43 AM   #2
Aquarium Advice Activist
 
Join Date: Dec 2006
Posts: 186
Going from 240 down to 20 TDS is a 91.67% rejection, which is not very good. I would get a better membrane and a standard 10" vertical DI cartridge add-on.
__________________

__________________
http://www.macna2007.com
Steven Pro is offline   Reply With Quote
Old 05-17-2007, 11:53 AM   #3
Aquarium Advice Addict
 
Join Date: Aug 2006
Location: not here anymore
Posts: 5,338
Re: TDS

Quote:
Originally Posted by SassyAngel111
...we have very nasty water TDS's just from the tap is 240x10 and I can get my TDS down to 20 something with the RO and a inline DI filter, but after a couple of uses my TDS is up to about 120 or so.
I'm confused by your "240x10" comment. Do you mean your tap TDS reading is 2400 ppm? Also confused because your inline DI filter uses resin beads anyway.

Even if it is 2400ppm, it still sounds like something is wrong with your RO membrane and you're sending high TDS water through your DI stage, drastically reducing the life of the DI cartridge. If there's a way to get to the water after the RO stage and before the DI stage, test it there and see how much the RO is taking out. Most likely it's not much.
__________________
Kurt_Nelson is offline   Reply With Quote
Old 05-17-2007, 06:40 PM   #4
Aquarium Advice Addict
 
Join Date: May 2004
Location: Poughkeepsie, NY
Posts: 3,294
What GPD membrane do you use? Water pressure through the ro/di unit do you know it? I ask because you can get better performance out of a ro/di with higher water pressure.
I run dual DI's and it helps lower TDS and phosphates.
I agree with Steve on his post and a vertical Di housing is the way to go, the water goes up through the cartridge getting better use of the resin.
I got a booster pump and I went from changing out my resin every 2 months to getting almost a year out of it. My start TDS is not as high as yours. My buddy had a TDS of over 700 and after he got a booster he gets better life from the resin also.
__________________
9/02-125 REEF, 125 lbs LR,LS 4x160 VHO, Reef Devil /Sump, Fuge
7/03-55 FOWLR 60lb LR, 50 lb SD sand 2x40 NO strip light, Reef Devil/sump, Fuge

TANK PICS http://www.aquariumadvice.com/viewtopic.php?t=98202
seaham358 is offline   Reply With Quote
Old 05-17-2007, 06:50 PM   #5
SW REEF 18+ YEARS
Community Admin
 
melosu58's Avatar



Tank of the Month Award
 
Join Date: Oct 2004
Location: Virginia
Posts: 38,244
I also agree with Steve as the vertical DI will be better.
__________________

SITE ADMINISTRATOR

You can view many of my fish and corals in my photo albums in my profile.

View my tank


AA Community Rules|AA TOS

Forums 101 - posting, accounts, basics
melosu58 is offline   Reply With Quote
Old 05-17-2007, 11:39 PM   #6
Aquarium Advice Activist
 
Join Date: Mar 2006
Location: Buckeye, AZ
Posts: 177
Ok guys I do have a booster pump, my membrane is for 75gl. I just tested my water and here are the results:
Plain tap is: 1720
from holding tanks 220
from DI 62
right from the Membrane 208
So should I just change out the membrane which is only 1yr old and get a vertical DI instead or what. I know I have not had any problems with my tank since I have gone from a 29gl to a 50 to a 90gl. The 90 has been set up for about 1 1/2 months now
My Parm are:
PO4 =0
NO2 = 0
NH4 = 0
Ca = 390
Alk = 10.6
Temp = 78.6 to 79.3
Sal = 1.027 useing a refactor.

Corals are doing great and so are the fish
__________________
SassyAngel111 is offline   Reply With Quote
Old 05-18-2007, 12:22 AM   #7
Aquarium Advice Addict
 
Join Date: Aug 2003
Location: philadelphia. PA.
Posts: 2,679
Quote:
Plain tap is: 1720
That is extraordinarily high. A "normal" TDS level that is on the high side is about 300-500. Have you calibrated your TDS meter lately?
__________________
Mike
MT79 is offline   Reply With Quote
Old 05-18-2007, 12:24 AM   #8
Aquarium Advice Addict
 
Join Date: Aug 2006
Location: not here anymore
Posts: 5,338
I wouldn't doubt 1720 from Arizona. Most of that is pretty nasty stuff. (Sorry... no offense. I'm just from the land of very nice water in WA state! But people here still buy bottled water to drink. Go figure.)
__________________
Kurt_Nelson is offline   Reply With Quote
Old 05-18-2007, 12:39 AM   #9
Aquarium Advice Addict
 
Join Date: Aug 2003
Location: philadelphia. PA.
Posts: 2,679
It's only 300 or so in the Philly area, and we have crappy water IMO/IME. Some people online have <100 TDS from the tap. If Arizona water is that high, I would not drink the tap water.!
If your TDS really is that high, I think two RO membranes would be best(you may need two or more DI units as well). I've seen units using multiple RO membranes in the past. Otherwise you are going to blow through DI resin. Generally, the purpose of adding a DI to an RO unit is to get TDS down to 0. The DI is used to soak up what little is left that the RO will not.
__________________
Mike
MT79 is offline   Reply With Quote
Old 05-18-2007, 07:31 AM   #10
Aquarium Advice Activist
 
Join Date: Mar 2006
Location: Buckeye, AZ
Posts: 177
Kurt, no offense taken, we are with a private water company and it is well water on top of that, the water company says there is nothing wrong with their water and it is safe to drink just from the tap (yea). I never thought about running two membranes, so I guess I will go searching the great wide web for another membrane and and a vertical DI unit. Thanks guys for the info.
__________________

__________________
SassyAngel111 is offline   Reply With Quote
Reply

Please support our sponsors and let them know you heard about them on AquariumAdvice.com

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
TDS meter... TDS? stratmaster General Hardware/Equipment Discussion 2 09-25-2009 06:29 PM
TDS? roka64 General Hardware/Equipment Discussion 6 11-28-2006 11:39 AM
TDS in....TDS out of RO well water for reef jackdp Saltwater Reef Aquaria 8 11-26-2006 10:59 AM
What should my tds level be? havefun Saltwater Reef Aquaria 3 02-26-2005 02:15 PM
TDS? seafan Saltwater Reef Aquaria 20 12-03-2004 06:10 PM







» Photo Contest Winners








Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 04:04 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.