RO Water vs My Tap water

Discussion in 'Water Parameters and Additives' started by dallasg, 10 Feb 2009.

  1. dallasg

    dallasg Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,771
    Likes Received:
    582
    Location:
    Sandton
    hi all,

    so i have a RO unit that makes 0tds, i added the tunze calcium thingy, and get a tds of 10, now my tap water has a tds of 15, when i fill my 1500L system, can i use the tap water for the cycle period, doing water changes with RO water to eventually swop out the tap water, or just leave it as is.

    thanks
     
  2. AdS Guest




    to hide all adverts.
  3. mandarinman

    mandarinman

    Joined:
    18 Oct 2007
    Posts:
    6,377
    Likes Received:
    70
    Location:
    capetown,durbanville
    just remember that whatever you put in your tank will seep into your liverock and lie in your substrate and dsb. imho try and keep whatever you put in your tank as 'pure' as possible. that way you wont haveto deal with the possible outbreaks from the additional nutrients or use chemicals to remove later(ro cheaper than phosguard etc)
     
  4. dallasg

    dallasg Thread Starter Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,771
    Likes Received:
    582
    Location:
    Sandton
    thanks, was just asking as even though the diff is 5, would such a small diff be that bad
     
  5. Neil H

    Neil H Moderator MASA Contributor

    Joined:
    11 May 2008
    Posts:
    2,795
    Likes Received:
    56
    Location:
    JHB
    Only bad things happen quickly in marines ........ Take your time and use your RO machine!
     
  6. gaboon

    gaboon

    Joined:
    14 Nov 2007
    Posts:
    2,241
    Likes Received:
    5
    Location:
    Northriding
    Have you got a DI thingy on your RO unit. That should bring it down to 0.
     
  7. mandarinman

    mandarinman

    Joined:
    18 Oct 2007
    Posts:
    6,377
    Likes Received:
    70
    Location:
    capetown,durbanville
    i think a few tests would determine phosphates etc. remember five percent difference is actually a thirty three percent increase!
     
  8. dallasg

    dallasg Thread Starter Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,771
    Likes Received:
    582
    Location:
    Sandton
    thanks guys
     
  9. crispin

    crispin

    Joined:
    22 Jan 2008
    Posts:
    12,223
    Likes Received:
    160
    Location:
    Lilliehammer, Norway
    besides that TDS, TOTAL dissolved solids.....do u actually know what the 33% increase is? Not worth the risk in my view. RO seem to be a good system to me, but then so do skimmers:)
     
  10. dallasg

    dallasg Thread Starter Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,771
    Likes Received:
    582
    Location:
    Sandton
    hahaha
     
  11. Mouse

    Mouse

    Joined:
    21 Oct 2008
    Posts:
    853
    Likes Received:
    14
    Location:
    Blouberg by the sea
    For someone who spends ALL day on MASA, I'm surprised you even asked the question Dallas! :razz:
     
  12. dallasg

    dallasg Thread Starter Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,771
    Likes Received:
    582
    Location:
    Sandton
    i am bored :)

    but always good to learn things :) why i asked is that i filled with tap water to test plumbing etc, and dont feel like emptying 1500L :)
     
  13. Mouse

    Mouse

    Joined:
    21 Oct 2008
    Posts:
    853
    Likes Received:
    14
    Location:
    Blouberg by the sea
    unlucky for you (and your boss) :lol:
     
  14. dallasg

    dallasg Thread Starter Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,771
    Likes Received:
    582
    Location:
    Sandton
    almost my own boss :)
     
  15. Tobes

    Tobes Retired Moderator

    Joined:
    30 Nov 2007
    Posts:
    9,482
    Likes Received:
    118
    Location:
    A Beautiful place!
    The TDS is important yes, but there are also other chemicals in the tap water like chlorine that the counsel add to remove all the chemicals humans add :whistling:
    The carbon and other media in the RO unit removes that :)
     
  16. dallasg

    dallasg Thread Starter Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,771
    Likes Received:
    582
    Location:
    Sandton
    let me clarify why i asked, i used tap water to test if my system all works, no leaks etc and didnt really want to waste the 1500L of water there is in it, so was just seeing how bad it could be seeing as it had 5 more than my RO which is mostly calcium :)
     
  17. Apollo

    Apollo

    Joined:
    25 Sep 2008
    Posts:
    1,076
    Likes Received:
    67
    Location:
    Fourways
    Dallas,

    From the tap water I've tested in Woodmead & Buccleuch , the PO4 value was less than 0.05 , Nitrate = 5 and a TDS reading of approx 20ppm

    Problem would be the contamination with heavy metals such as lead , copper etc. and then of course there are silicates.

    You could probably test for all of these and take a chance , but I wouldn't .

    IMHO , I'd rather dump the 1500l of tap water or use it for some other purpose, than spend huge amounts of money later in combatting water problems in the tank.

    Just My 2c;)
     
  18. dallasg

    dallasg Thread Starter Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,771
    Likes Received:
    582
    Location:
    Sandton
    thanks, i think i will use it to water the complex gardens :)
    might be a little salty :)
     
  19. Apollo

    Apollo

    Joined:
    25 Sep 2008
    Posts:
    1,076
    Likes Received:
    67
    Location:
    Fourways
    Dallas,

    One more thought : Why don't you just pump the 1500l back through the RO unit ?
     
  20. dallasg

    dallasg Thread Starter Moderator MASA Contributor

    Joined:
    14 Dec 2008
    Posts:
    16,771
    Likes Received:
    582
    Location:
    Sandton
    hmmm that sounds like a great idea, will def give that a try
     
  21. crispin

    crispin

    Joined:
    22 Jan 2008
    Posts:
    12,223
    Likes Received:
    160
    Location:
    Lilliehammer, Norway
    tap water? no salt addded? why would it be salty?
     
Recent Posts

Loading...
Similar Threads - Water water Forum Date
Ways to reduce Water Temperature General Discussions and Advice 1 Dec 2016
TDS Reading of RO Water Water Parameters and Additives 17 Nov 2016
Starting a new tank - water question Beginner Discussions 12 Nov 2016
Water shortages/restrictions General Discussions and Advice 9 Nov 2016
Cloudy water Water Parameters and Additives 7 Nov 2016
Fresh Sea water / Bangkok contactes Advanced Topics 6 Nov 2016
Water storage container General Discussions and Advice 23 Oct 2016