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TDS ADVISE.

Discussion in 'Basic Care and Husbandry' started by zephyr4, Apr 5, 2017.

  1. zephyr4

    zephyr4 New Member

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    I have just bought a TDS meter and in my tank the TDS is very high 447 ppm out of the tap I get a reading of 74.
    I use an external filter with ceramic rings foam and biohome media in the filter the inside tank a thin layer of filter sand and a small piece of wood bought from an aquatic shop, can anyone tell me why the TDS is going up.

    I forgot to say I do 3-4 or even 5 water changes a week.

    Thanks for any help z4.
  2. zephyr4

    zephyr4 New Member

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    Update.

    I just remembered I took quite a bit of the filter sand out of the tank a couple of months ago and put it out side in a bucket there was some tank water in the bucket but it has since filled up with rain water
    I checked the TDS and it was 68.
  3. jimbo

    jimbo BIDKA Mentor Staff Member

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    What is ph out of tap and in tank ?
  4. zephyr4

    zephyr4 New Member

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    Tap is about 7 tank 6.
  5. Graham C

    Graham C Active Member

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    Hard to imagine how that could happen given your frequent water changes. What type of sand is on the base of the tank? If it's coral sand it could be dissolving in your slightly acidic water. That in itself should raise the pH, so unlikely. Over feeding could be another cause, but water changes should deal with this. What's your nitrate level in the tank?
  6. zephyr4

    zephyr4 New Member

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    I am out of the nitrate tester the sand is filter sand which I have had for quite a while with no problem. I will do more water changes and cut down on the food to see
    if that helps.

    thanks for the reply.
  7. Artur

    Artur Administrator Staff Member

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    Most possible cause is that the sand contains traces of salt. This would raise ppm without raising pH.
    simon marshall likes this.
  8. zephyr4

    zephyr4 New Member

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    I have a bucket outside with the sand in which I took out of my tank a couple of months ago there was some tank water in the bucket it also has some rain water in I tested the TDS
    and it is only 68ppm.
  9. Artur

    Artur Administrator Staff Member

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    So maybe up your water changes. Nitrates and other waste will increase tds as well. On the other hand TDS is least important parameter in my opinion.
    jizzy likes this.
  10. zephyr4

    zephyr4 New Member

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    Thanks for the info, I have a ro unit coming I will use some ro water and cut back on feeding.

    z4

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