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

Join Aquarium Advice Today
Thread Tools Search this Thread Display Modes
Please support our sponsors and let them know you heard about them on AquariumAdvice.com
Old 02-26-2005, 01:28 AM   #1
Aquarium Advice Freak
Join Date: Feb 2005
Location: Dubuque, Iowa
Posts: 354
What should my tds level be?

My RO unit arrived today and since I can't fill my tank (story in another post) I've been playing with the unit (getting it mounted on the wall etc).
I used the tds meter on just my plain tap water and it was around 375. Then, after letting the RO unit run for 15 minutes I tested it and it was 9. I know if I also had a DI unit the reading would probably be 0, but is 9 typical for just RO?

havefun is offline   Reply With Quote
Old 02-26-2005, 07:25 AM   #2
AA Team Emeritus
Join Date: May 2002
Location: Virginia
Posts: 2,256
Send a message via ICQ to fishfreek Send a message via AIM to fishfreek Send a message via MSN to fishfreek Send a message via Yahoo to fishfreek
the TDS meter is not an inline unit I take it since you tested your tap water with it. When you test your TDS make sure the vessle your using to hold the test water is absolutly clean. Just a few dust particles can screw up your TDS measurements. Also make sure you use seperate vessles for tap and RO water testing or you wipe and dry the vessle upside down before testing the RO. The reason is that RO is so close to pure H20 that even the most minute contaminates can give a false TDS measurement.

I would be willing to bet if you measured your RO a half dozen times over the corse of an hour you might end up with 4 different readings all within 3-5 points of eachother. At the low level your testing that can be a fairly significant percentage of error but at the dirty tap water side a 3-5 diffierance is insignificant.

I would say acceptable RO TDS measurements would be 10 or under. Yes adding an DI stage should bring taht down to 0-3.
Remember dont tap the glass, your fish will think you're an idiot -Anonymous mother

Check out our articles area. 30+ Aquatic articles for your enjoyment
Are you in or around the Shenandoah Valley area? If so click here to join our regional forum.
fishfreek is offline   Reply With Quote
Old 02-26-2005, 12:06 PM   #3
Posts: n/a
With a TDS of 375 going in and 9 coming out without a DI stage, that's quite good. I've seen some RO filters only able to keep it under 50. I'd say that's about as good as your going to get unless you add the DI.

With such a high TDS, you'll need to keep a close eye on your prefilters, they will exhaust quickly.

  Reply With Quote
Old 02-26-2005, 01:15 PM   #4
Join Date: Oct 2003
Location: WI
Posts: 1,783
9 is great especiallay since it was 375 going in!
captivereefs is offline   Reply With Quote


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 05:29 PM
TDS SassyAngel111 Saltwater Reef Aquaria 9 05-18-2007 06:31 AM
TDS? roka64 General Hardware/Equipment Discussion 6 11-28-2006 10:39 AM
TDS in....TDS out of RO well water for reef jackdp Saltwater Reef Aquaria 8 11-26-2006 09:59 AM
TDS? seafan Saltwater Reef Aquaria 20 12-03-2004 05:10 PM

» Photo Contest Winners

All times are GMT -4. The time now is 11:09 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, vBulletin Solutions, Inc.