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  • Results 1 to 4 of 4

    Thread: TDS/ Salinty

    1. #1
      daniel95 is offline Member
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      TDS/ Salinty

      Hi all,

      I've read many older threads on this and have picked up varying answers to this.

      I have my pond currently reading 0.2% salinity and TDS reads 2000ppm. My EC reading is 4300(not sure what value this reads uS/cm(?)). I also use calgrit (calcium carbonate) in my filters to provide minerals/stable pH.

      My issue is that some threads have said the TDS equals the salinity read (correct in my case) but other threads have said TDS also accounts for carbonates, Ca, Mg, Na. So do I truly have a salinity of 0.2% or are the other readings of carbonates, Ca, Mg, Na interfering?

      Not the best with chemistry so any help appreciated !

      This is the pen im using
      ebay.com.au/itm/284564243173?hash=item424159c2e5:g:VRwAAOSwDeFhtD8 1


      Thanks!

    2. #2
      Paul Sabucchi's Avatar
      Paul Sabucchi is online now Senior Member
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      TDS with your pen is a measurement of water conductivity, so a crude measure of all ions present in the water (i.e. all the atoms that are charged and hence can conduct electricity)
      46000 liters with only wetland filtration

    3. #3
      daniel95 is offline Member
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      Quote Originally Posted by Paul Sabucchi View Post
      TDS with your pen is a measurement of water conductivity, so a crude measure of all ions present in the water (i.e. all the atoms that are charged and hence can conduct electricity)
      Sorry that went over my head so that means the actual salt in the water is less than 0.2%?

    4. #4
      cottagefog is offline Senior Member
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      Do you know the gallons of your pond, and how much salt have you added to support your readings of 2% ?

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