Salt Consumption

Discussion in 'Water Parameters and Additives' started by Warr7207, 8 Mar 2008.

  1. Warr7207

    Warr7207

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    I have been running my tank for 4 months now and have noticed that no salt gets consumed.

    What I am saying is my water changes are done at 1.025 and my top up's are RO water (no salt), and the SG level never drops. This indicates that no livestock consumes salt or whatever compounds constitute the SG level of the water ?

    Is it heavily sps coral stocked tanks that consume "salt" ?
     
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  3. Alfie

    Alfie

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    Warr no salt is consumed by any livestock in the tank. When the water evaporates the salt remains and should you not use top up water the sg will jump up. The addition of RO allows your sg to remain constant. Hence when you do a water cgange you take out water that has an sg of say 1025 and replace the same volume of water with an sg of 1025 thus remaining at 1025.
     
  4. OP
    Warr7207

    Warr7207

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    Thanks Alfie :thumbup::thumbup:
     
  5. gaz19

    gaz19

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    but, when your skimmer skims alot, some salt water is removed and is then replaced by RO water(via top up unit). over along period of time the SG can drop if not monitered.
     
  6. Shaun

    Shaun Retired Moderator

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  7. OP
    Warr7207

    Warr7207

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    I skim as heavily as possible without actual water flowing into the cup. I also have an "overkill" skimmer for my volume of water - DNW200 for 400l
     
  8. Rory

    Rory Admin

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    The volume of the stuff that isn't consumed that makes the water salty (sodium chloride) far outweighs the volume of the "useful" stuff that is consumed (all the other elements we supplement).

    If your salinity is 35ppt (around 1.024) then most of those "parts" are sodium chloride (just salt). About 1.35 of those parts would be magnesium (at Mg = 1350ppm), 0.4 or so being Ca, 0.2 being CaCO3 carbonate alkalinity and even less of everything else.

    So if somehow your corals etc managed to absorb every bit of calcium and every other trace element until everything tested 0 your total salinity would probably drop to 1.023 from 1.024 or something.

    Putting in supplements also of course raises your salinity but you're very unlikely to be able to detect a change because it will be so small.
     
  9. Rory

    Rory Admin

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    That's not overkill at all! :p
     
  10. OP
    Warr7207

    Warr7207

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    Cool, so the the actual salt level not changing is really a normal part of the tank's life. Need to watch the other elements that the corals consume.

    Thanks
     
  11. Rory

    Rory Admin

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    Yep. You should always check to be sure etc as skimming and salt creep does lower salinity so you might have to do your next water change with a slightly higher salinity etc.
     
  12. OP
    Warr7207

    Warr7207

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    I always check, me and my kids love using the refractometer :p
     
  13. Mekaeel

    Mekaeel Moderator

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    same here :lol:
     
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