Go Back   The Reef Tank > The Reference Place > Water Chemistry Archive

Old 03-01-2004, 01:48 PM   #1
Join Date: Nov 2003
Location: San Francisco
Posts: 49
Shouldn't an RO unit remove phosphates???

I purchased the AquaFX Stingray RO unit to purify my top off water. I have a 25 gal tank and don't need that much water, so I figured this unit would do me fine. I have been having cyano problems and I just got my saltifer phosphate test kit and tested my RO water, and it showed a low concentration of phosphates. I am going to go re-test, but does this sound right?
FFSchooley is offline  
Old 03-02-2004, 09:25 PM   #2
Jaguar Shark
mapster's Avatar
Join Date: Jan 2002
Location: MA
Posts: 1,083
yes it should. Have you re-tested yet? Have you tested the tap water to compare?
mapster is offline  
Old 03-02-2004, 09:53 PM   #3
Master of Perplexity
Join Date: Jun 2003
Location: Panama City Beach FL
Posts: 3,451
Images: 9
FF, did you just start up the unit? They say to toss the first 10 gallons or so. What kind of receiving container do you run the unit to? Some rubbermaids can be made of recycled plastic that can leach phosphates. Lastly, are you sure about your Salifert test kit? I, within the last month, got a Mako from AquaFX and it checked out ND for phosphate using a Hach DX-5000 Spectrophotometer. It also produced water with a silica reading of 3ppb. Not bad for a $300 syystem!
yardboy is offline  
Old 03-03-2004, 12:18 AM   #4
Little Fishy
Reefrubble's Avatar
Join Date: Feb 2004
Location: Weeki Wachee, Florida
Posts: 342
Images: 5
I needed to add a DI unit to my RO unit to eliminate phosphate.
Reefrubble is offline  
Old 03-03-2004, 01:31 AM   #5
Big Fishy
dwall174's Avatar
Join Date: Mar 2003
Location: Southeast MI
Posts: 680
Images: 12

The TDS of my supply water is only 125 but, my PO4 is like 3.5! I get a reading of 2~3 TDS after My RO but before the DI, However there’s still a reading of 0.5 PO4 that the RO doesn't remove. The DI will remove the remaining PO4, But I need to replace it once it starts to read 0.1 TDS because that means the DI is used up & will allow the PO4 to pass through.

I'm planing on adding a second back-up DI & an electronic purity monitor to my unit that way I can see when the first cartridge is exhausted then replace it with the back-up cartridge & add a fresh one to the second housing.

Tank Specs

Gallery Pics
dwall174 is offline  

phosphate test kit , salifert test

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

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 On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Phosphates Dancing4raiin General Reef Discussion 16 11-02-2007 10:37 PM
Does Macro Algae Remove Phosphates AlgaeMan General Reef Discussion 3 06-03-2006 12:20 PM
Phosphates.....? versivix General Reef Discussion 19 10-01-2005 10:38 AM
to remove or not to remove, that is the question.... reefguy General Reef Discussion 6 03-27-2002 10:08 AM
phosphates... nisom88 General Reef Discussion 9 02-13-2002 12:18 PM

Similar Issues
Issue Issue Starter Forum Replies Last Post
how to remove an anenome jadavis01 General Reef Discussion 4 2000-12-08 14:48:00
how to remove mushrooms from rocks Kinesthesia General Reef Discussion 2 2001-06-26 14:06:00
how to reduce phosphates in reef tank obrut General Reef Discussion 21 2012-04-20 19:14:06
how to assemble ro unit Martinwinte General Reef Discussion 2 2013-01-09 20:32:18
how do i remove pink algae from my marine tank MontanaRocknReefer General Reef Discussion 4 2001-05-19 00:13:00

Sponsor Our Community

All times are GMT -5. The time now is 09:41 PM.

Powered by
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
Our lawyer tells us that, by pressing the "New Thread" or "New Reply" button, you acknowledge that the opinions and information expressed in your article are yours alone and not those of thereeftank.com, dba The Reef Tank. Further, you agree to indemnify The Reef Tank, its moderators, administrators and agents from any and all liability which may arise as a result of your article. (C)opyright 2006 TheReefTank.com