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TDS readings, what is normal?

Discussion in 'General Plant Topics' started by ghostsword, Feb 20, 2012.

  1. ghostsword

    ghostsword Lifetime Charter Member
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    I have purchased a TDS reader to check the RO water I've been producing, as it managed to do 80L in a day. The reading was 19.

    I then measured the tanks and got a shock. The main tanks where 600, I change the water with 50% RO water. I dose ferts an they have CO2 being pumped in.

    A low tech tank I have, a day after doing 50% water change is measuring 500.

    Now what is acceptable? Does it matter?

    Thanks,
    Luis


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  2. Biollante

    Biollante Lifetime Charter Member
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    Total Dissolved Solids

    Hi Luis,

    Not bad 19-ppm TDS is actually pretty good for hobbyist RO units without much filtration ahead of them.

    I need to know more about the meter and your technique to comment on the aquarium TDS.

    Assuming your equipment and methodology are correct, a TDS reading of 600-ppm seems high,:cower: are you sure you are reading only dissolved solids.:wink-new:

    Try filtering the aquarium water from mid-depth through a coffee filter first.:)

    Biollante
     
  3. Tom Barr

    Tom Barr Founder
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    My tap runs about 80-100 uS, after dosing everything, roughly 280-300 uS.
    Declines to about 200uS before the next water change.

    What is the tap water's TDS/Conductivity?
     
    Berk likes this.
  4. ghostsword

    ghostsword Lifetime Charter Member
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    Thanks. The tap water is 300.

    I do one water change of 50% a week, and dose a all in one solution.

    I have now started to do the 50% water change with RO water mixed with tap water at 75/25 mix. I will measure the conductivity of what I put on the tank.

    Maybe more water changes? :)

    The RO unit (RO man unit) is pretty good. In 24 hours it is filling a 80l bucket.

    Thanks for the replies.


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  5. Tom Barr

    Tom Barr Founder
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    Well, you cannot over do water changes, they might become a hassle however, or the RO volume needed might become an issue.

    If you build up more than 200-300 over the tap, then something is amiss.
     
  6. Biollante

    Biollante Lifetime Charter Member
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    Whole House Filtration


    Hi Luis,

    Your water sounds rather like mine.
    :eek::rolleyes:

    Since you are using an RO unit, I am assuming you are not principally raising African cichlids.
    :nonchalance:

    Without information on the meter, technique and so forth, the obvious thing is to increase the percentage of RO to tap.
    :)[HR][/HR]
    For any reading, this with similar situation one suggestion is to put some filtration in front of the RO unit.
    :)

    The whole house water filters are cheap and effective (like me
    :glee:).

    A whole house sediment filter with 50-micron filter followed one with 10-micron filter followed by one with 5-micron carbon filtration will improve the household water and drastically improve the RO units’ performance and extend the life of the membrane. An added benefit should there be a water softener there will be significantly less Sodium added to the water.

    For US$100.00 I cannot think of anything else that will improve your water quality.
    :encouragement:

    Another thing that can improve RO performance and membrane life is a pressure pump.

    Biollante
     
    #6 Biollante, Feb 21, 2012
    Last edited by a moderator: Feb 22, 2012
  7. ghostsword

    ghostsword Lifetime Charter Member
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    Thanks. Yep, the water in london is pretty bad, we get bottled water to drink. :)

    I will do more water changes, although I have no issues with plants growing the scale dirt on the glass and filter outlets is putting me off, so I got a RO unit to get as much cleaner water as possible.

    So technically if I put water into the tank at 100, even with EI dosing it should not be above 300 after a couple of days, right?

    I will post more details about the setup.


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  8. Tom Barr

    Tom Barr Founder
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    If you have RO, why would you buy bottled water to drink? What do you think they do to bottled water? Typically just run it through carnon perhaps and maybe RO or other filtration, they take the tap water wher eI live and simply run through a little carbon, then bottle and sell it at 3000% profit.
    Use your RO water.
     
  9. ghostsword

    ghostsword Lifetime Charter Member
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    I know!! :) but I was drinking bottled water before, just got the RO unit last week.

    I tasted the RO but the water tasted funny, I am not used to the taste. Good for tea. ;)

    We stopped buying bottled water now, I just fill a 25l jerrycan every few days.


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  10. Tom Barr

    Tom Barr Founder
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    They add some sulfate salts, CaSO4 and MgSO4 to add flavor to so called spring water, you might not be use to pure water, most prefer a little salt.

    Carbon should remove any and all taste/odor issues and chlorine.
     
  11. ghostsword

    ghostsword Lifetime Charter Member
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    Yeah. Yesterday I run it past a carbon filter then added some epson salts.

    It was the best water I have ever drank.

    Now, isn't it amazing that we are so far removed from pure water (at least in London) that when we drink the good stuff it tastes odd? :)


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