Confused by TDS test - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 10-27-2011, 08:04 PM Thread Starter
ptr
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Confused by TDS test

Hi,

I'm currently cycling my 65g, and am wondering about something. Here is what I have in the tank:
- 6 gal. of substrate from http://www.aquariumplants.com/
- 3 large pieces of driftwood (one still floating)
- about 12 small river rocks

I've used Prime in the tank after filling it up, and squeezed some used filter media from my older tank.

My filter is an aquaclear 110 (and the water is crystal clear after 3 days).

Now, here's the strange part: my tap water shows a TDS of 48. The tank water shows a TDS of 355 !

Is this normal ? Any idea what could cause this ?

Many thanks,

P.
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post #2 of 7 (permalink) Old 10-27-2011, 08:23 PM
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Might be initial dust/minerals dissolving from the substrate. Seems common with the fracted clay substrates, and goes away with time. Put a cup of the substrate in a jug with some fresh tapwater, and see if it raises the TDS.
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post #3 of 7 (permalink) Old 10-27-2011, 08:32 PM Thread Starter
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ok, so it will go down when I do a water change I guess. What confused me even more, is that it climbed from 287 to 355 in just 1 day.
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post #4 of 7 (permalink) Old 10-27-2011, 08:54 PM
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Quote:
Originally Posted by ptr View Post
ok, so it will go down when I do a water change I guess. What confused me even more, is that it climbed from 287 to 355 in just 1 day.
well anything in the substrate can be stirred up or released into the water colum thus raising the tds overall, so its very possible to raise the tds expecially if you have a rich substrate imo. stability is what you should aim for not just super low tds but that imo.
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post #5 of 7 (permalink) Old 10-27-2011, 08:59 PM
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Do a large water change(80%) and report back.
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post #6 of 7 (permalink) Old 11-04-2011, 04:51 PM Thread Starter
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Changed about 75% in order to plant - TDS went down to 200. Still much higher than straight out of the tap.


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post #7 of 7 (permalink) Old 11-04-2011, 04:58 PM
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It's pretty normal... NYC's water is pretty soft too so you don't have too much tds to begin with.


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