TDS reading high

Discussion in 'Water Parameters and Additives' started by Lemar, 9 May 2010.

  1. Lemar

    Lemar

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    Hi

    My nitrate reading is quite high (has been for a couple of months).
    Approx 30-50. I have a good skimmer and algae scrubber so it doesn't make sense

    Bought a TDS meter to test my water and this is what I got:

    Municipal Water = 274
    R/O water = 60
    R/O water in my top-up drum = 80

    Does this mean my R/O unit is not good enough, or is there maybe some kind of contamination? Is our municipal water reading so high that the R/O unit just can't keep up?

    Does anyone know whether there a solution for the problem or will we have to invest in a new R/O unit (which I really hope is not the case due to $$$)

    Thanks
     
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  3. Singularity

    Singularity Hmmm amper!

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    hi lemar, how old is the unit ? when did you last change the pre filters and membrane ?
     
  4. Fires

    Fires

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    Hi Lemar,

    I had the same problem,then i replaced my filter material on the RO filter and it was as good as new !!! TDS Reads between 0 and 3
     
  5. Lemar

    Lemar Thread Starter

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    R/O unit is approximately 1.5 years old. Replaced the filters +- 3 months ago. Membrane (as far as I know) has never been replaced, will have to confirm with my husband.

    At what intervals should the filters and membrane be replaced?
     
  6. Singularity

    Singularity Hmmm amper!

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    membrane yearly, and pre filters atleast every 6 months
     
  7. Fires

    Fires

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    The mambrane are very important.Do a complete filter change on your system.The you will see the end result.
     
  8. Singularity

    Singularity Hmmm amper!

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    also contact marco to get a DI "chmaber" for the unit.
     
  9. Lemar

    Lemar Thread Starter

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    Ok thanks for the advice guys. Will implement as soon as possible.
    What is a DI chamber?
     
  10. Fires

    Fires

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    I agree with Singularity,You must have a DI Chamber on the unit!!!:thumbup:
     
  11. Singularity

    Singularity Hmmm amper!

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  12. Lemar

    Lemar Thread Starter

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    Thanks i contactes him. Will let you guys know the results.
    Is this the reason for the high nitrates?
     
  13. Broder

    Broder Mudshark

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    Not the reason for high N. Your scrubber will eliminate the very slight increase in TDS. Reduce feeding, replace scrubber lights and skim wet. Don't expect instant results. Do you back-wash your ro unit?
     
  14. Reef Maniac

    Reef Maniac MASA Contributor

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    Check the TDS of the "waste water" just to make sure that you do not have the two pipes the wrong way round... if the waste water's TDS is a lot higher, then you do need to change the RO membrane.

    That would depend on how dirty your input (municipal) water is, and on how much chlorine your municipality adds to your water. On average, I would suggest that you replace the pre-filters every 3 months, and the membrane as soon as your TDS of the RO water rises above 6-8.

    I agree with Mudshark that the high TDS is not the direct cause of your high nitrate level (although it would contribute). Do you have a DLSB in your system? Without any more info, I would venture a guess that you are either feeding too much, or your sand bed is not deep enough (or both...)

    Hennie
     
  15. Dane

    Dane

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    Really?? Surely some DS don't flocculate....? I thought most of the TDS count in tapwater was accounted for by minerals, not organics?
     
  16. RiaanP

    RiaanP Moderator

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    Also check your TDS meter. Is it really correct? Take it with you to the LFS and test the same water with your TDS and theirs. If they do not have a TDS, then ??? Get another LFS?

    Filters, yes that depends. Mine is now almost year and a half and my TDS is now about 3. So yes, depends on your municipal water quality.
     
  17. Broder

    Broder Mudshark

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    Correct Dane, but the inorganic portion of the total dissolved solids will not be contributing to increased nitrate.

    Before we get sidetracked lets focus on the problem at hand, ie high nitrate. Lemar, as Hennie asked, how deep is your DSB? When did you last change your scrubbers lights?
     
  18. Lemar

    Lemar Thread Starter

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    How often should scrubber lights be replaced. Ours about a year old (if that old)
    R/O unit is backwashed approximately once every 3 weeks

    Ok hennie, will ask kevin to check tds of waste water sometime during the day. (but i'm certain that that should not be the problem)
    Please explain DLSB?
    My sand bed in DT is approx 8cm and the sand bed in sump approx 12cm

    Its a new TDS. Bought it on Saturday. It gives the same reading as our local water purification shop in town, so the TDS is accurate.
     
  19. Broder

    Broder Mudshark

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    The recommendation is every 3 months, but I push it to 6 usually. There is a noteable increase in growth with new lamps. I've found the Eurolux 45w ES lamps to be cheapest.
     
  20. Dane

    Dane

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    Every three months!!??? What! Surely they last longer if you cover them and ventilate?? That seems very wasteful!
     
  21. Reef Maniac

    Reef Maniac MASA Contributor

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    DLSB = Deep Live Sand Bed :)

    Hennie
     
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