[Timezone Detection]
Create Account - Join in Seconds!

User Name: Email Address:
Human Verification

What is one of the colors on a clownfish? (hint there is a clownfish on the CR logo in the top left corner of the page.)

Will a rodi remove the hardness from my water


Bookmark and Share
Results 1 to 5 of 5
  1. #1
    Jstadler - Reefkeeper CR Member
    Join Date
    Feb 2011
    Location
    Sand Lake/Grand Rapids
    Posts
    171
    First Name
    John

    Default Will a rodi remove the hardness from my water

    I've got very high ALK in my water change water, and was wondering if a RODI will take the hardness out of my water, in effect lowering my ALK. My tank water is testing in the 15 DKH and I tested my mixed change water and it tested in the 20's. Looking for opinions. Thanks in advance.

    Sent from my iPhone using Tapatalk

  2. #2
    BeakerBob - Reefkeeper
    RIP

    Join Date
    Sep 2009
    Location
    Lansing, Michigan
    Posts
    461
    Awards Photo of the Month Photo of the Month

    Default

    Quote Originally Posted by Jstadler View Post
    ...... was wondering if a RODI will take the hardness out of my water.....

    Sent from my iPhone using Tapatalk
    Yes, the use of RODI will remove the minerals that make water hard (ie calcium, magnesium, iron, etc.) through use of a water permeable membrane (RO) and ion exchange (DI) process. A measurement of this process is by a TDS meter that will measure the Total Dissolved Solids in the output RODI water. This TDS measurement is non-specific and will measure all solids that are dissolved in the water, not just the minerals that cause hardness like calcium or magnesium. So if the efficiency of the RODI unit is getting bad because the membranes & ion exchange media needs changing, you will see the TDS measurements increasing from the norm.

    Mixing a 15 dKH alk tank water with a higher 20 dKH alk change water will increase the total tank alkalinity. This increase will depend on the amounts of each that have been mixed together. You can reduce a high alk situation a couple ways: add low alk change water from a functioning RODI unit; or, if dosing, just dose calcium supplement and not the alk for a week and remeasure.
    BeakerBob - Past MMMC Club President, current Board Member
    imagephp?u1&amptypesigpic&ampdateline1261894023 - Will a rodi remove the hardness from my water

  3. #3
    Jstadler - Reefkeeper CR Member
    Join Date
    Feb 2011
    Location
    Sand Lake/Grand Rapids
    Posts
    171
    First Name
    John

    Default

    Bob. Thanks for your response. I have some brighwell reef code A And B, I haven't been dozing with it my cal stays pretty steady at 420-440. So your saying I can just dose the A and it will intern bring my alk down? How heavy should I dose, and how high is too high for cal?


    Sent from my iPhone using Tapatalk

  4. #4
    rmalone - Reefkeeper CR Member
    Join Date
    May 2010
    Location
    grand blanc, mi
    Posts
    388

    Default

    If the water your using to make saltwater is at 15dkh, your not going to see a huge drop in alk just by removing the alk portion of a 2 part. As Bob stated ro filtering will drop the alk of your base water substantially. Add in deionization and alk levels of your base water should approach zero. When you add your salt, assuming it's formulated properly, your alk will rise to acceptable levels.

  5. #5
    Jstadler - Reefkeeper CR Member
    Join Date
    Feb 2011
    Location
    Sand Lake/Grand Rapids
    Posts
    171
    First Name
    John

    Default

    Thanks for the info guys. I'm gonna stop at the LFS and buy a couple gallons of RO from them, mix it up with my salt and test that. In the meantime looks like I've got to research what system will be best for my application.

Similar Topics

  1. Remove the Rim from a 29g HQI Biocube?
    By jimsflies in forum DIY Projects & Plans
    Replies: 36
    Last Post: 08-22-2011, 08:51 AM
  2. Anemones How to remove a nem from LR
    By bluwc in forum Other Marine Life
    Replies: 3
    Last Post: 06-03-2011, 05:31 AM
  3. Calcium, Alk, Mg & pH carbonate hardness (kh)
    By mitchwelt in forum Chemistry
    Replies: 2
    Last Post: 02-02-2006, 01:00 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

About CaptiveReefs

    If you are interested in learning about reefkeeping or have a problem with your reef, our reefkeeping community is here to help. Feel free to ask a question or search our site. We have lots of experienced reefkeepers that are willing to provide free reefkeeping advice!

    Besides being a great resource for all levels of reef aquarium hobbyists, CaptiveReefs is a social experience that will enhance your enjoyment of reefkeeping. CaptiveReefs is committed to connecting reefkeepers with the support and information they need to grow beautiful coral reef aquariums.

Information

Connect with Us