TDS raising by itself - The Planted Tank Forum
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post #1 of 25 (permalink) Old 08-02-2011, 09:59 PM Thread Starter
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TDS raising by itself

i had this same problem in the past and it was very bad but it has started again, after adding RO water to the tank and it was reading 80ppm of TDS and i tested every couple of minutes and it was going up little by little. it was at 140ppm after adding 1tsp of Mg and Ca, and today its at 180ppm . am sure its going to go increase only, could anyone explain whats causing it. am using amazonia 2 soil which actually suppose to decrease the KH/GH.

i also have a 5g tank which i used the same ro water and it was 80ppm when i added it and today its at 60ppm, am using peat moss and flora max planted substrate.



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post #2 of 25 (permalink) Old 08-02-2011, 10:04 PM
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While a substrate might decrease kh, it isn't going to touch your TDS. There is no way to add anything and reduce tds.

What was your TDS BEFORE you did the water change? What was the TDS of the RO water.

And is your TDS meter calibrated.

What meter do you have?
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post #3 of 25 (permalink) Old 08-02-2011, 10:34 PM Thread Starter
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Quote:
Originally Posted by OverStocked View Post
While a substrate might decrease kh, it isn't going to touch your TDS. There is no way to add anything and reduce tds.

What was your TDS BEFORE you did the water change? What was the TDS of the RO water.

And is your TDS meter calibrated.

What meter do you have?
the tds straight from the ro/di is 0ppm and i mix some tap water to give it a 80ppm. tds was 250ppm before the water change, but i changed 80% of the water and after that tds was reading 80ppm for about 1 hour and then it started to raise. it was reading 140ppm after like 6 hours before i went to sleep, today after 20 hours later the tds reads 188ppm right now.

i use HM Digital TDS-EZ Meter which reads 0ppm when i tested the RO/DI water, it reads 300ppm from the tap. am sure its accurate enough to give some good reading. i also tested with the GH/KH API test kit and its almost the same results.

i cant think of anything that could cause the GH spike.

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post #4 of 25 (permalink) Old 08-02-2011, 10:42 PM
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What exactly are you dosing re: ca/mg. Which compounds. Both of them will raise GH.
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post #5 of 25 (permalink) Old 08-02-2011, 10:48 PM Thread Starter
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Quote:
Originally Posted by OverStocked View Post
What exactly are you dosing re: ca/mg. Which compounds. Both of them will raise GH.
am dosing calcium and magnesium sulfate. and rest are the NPK's.

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post #6 of 25 (permalink) Old 08-02-2011, 10:49 PM
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WHICH calcium. There are about 5 options out there.
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post #7 of 25 (permalink) Old 08-02-2011, 10:50 PM
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http://calc.petalphile.com/

This will show you exactly what your dosing will do to your water. You'll see that if you are dosing both of these, my guess is they are the problem...
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post #8 of 25 (permalink) Old 08-02-2011, 10:54 PM
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Quote:
Originally Posted by OverStocked View Post
What exactly are you dosing re: ca/mg. Which compounds. Both of them will raise GH.
Quote:
Originally Posted by happi View Post
am dosing calcium and magnesium sulfate. and rest are the NPK's.
NPK dosing will raise TDS too. anything added will register with very few exceptions. Rising TDS is one of my WC indicators.


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post #9 of 25 (permalink) Old 08-02-2011, 11:02 PM Thread Starter
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Quote:
Originally Posted by OverStocked View Post
http://calc.petalphile.com/

This will show you exactly what your dosing will do to your water. You'll see that if you are dosing both of these, my guess is they are the problem...
in that case which one would you recommend, am not sure which one i have, am not good with chemicals, but i will try my best to find out what i got.

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post #10 of 25 (permalink) Old 08-02-2011, 11:06 PM Thread Starter
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http://www.aquariumfertilizer.com/in...ShowItemStart=

http://www.aquariumfertilizer.com/in...ShowItemStart=

i think this is what i got.

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post #11 of 25 (permalink) Old 08-02-2011, 11:12 PM
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With a starting TDS of 80, I doubt I'd dose either unless I had a problem.

Your Calcium is raising by .27 dGH per dose. Your Mg .19 dGH.
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post #12 of 25 (permalink) Old 08-02-2011, 11:13 PM
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This is quite common in tanks with relatively new aquasoil. It is simply leaching nutrients into the water column.

Your tds isn't anywhere near being problematic. The only inconvenience I can see it causing is if you intend to breed something that requires ultra low TDS.

Everything else being equal, TDS will almost always rise since the bacteria is breaking down solids into nitrate and other compounds, so it isn't really anything to be worried about.
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post #13 of 25 (permalink) Old 08-02-2011, 11:22 PM Thread Starter
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Quote:
Originally Posted by OverStocked View Post
With a starting TDS of 80, I doubt I'd dose either unless I had a problem.

Your Calcium is raising by .27 dGH per dose. Your Mg .19 dGH.
i guess am gona stop dosing both and see what happen next, in my 5g i don't dose anything at all, maybe that's why its lower on the tds.

in my 50g even if i don't dose anything i experience tds increase.

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post #14 of 25 (permalink) Old 08-02-2011, 11:24 PM Thread Starter
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Quote:
Originally Posted by snausage View Post
This is quite common in tanks with relatively new aquasoil. It is simply leaching nutrients into the water column.

Your tds isn't anywhere near being problematic. The only inconvenience I can see it causing is if you intend to breed something that requires ultra low TDS.

Everything else being equal, TDS will almost always rise since the bacteria is breaking down solids into nitrate and other compounds, so it isn't really anything to be worried about.
the aqua soil is about 3 months old. but this is a big increase in tds in just one day. from 80-188 is 100ppm increase in just 1 day.

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post #15 of 25 (permalink) Old 08-03-2011, 10:59 AM
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A TDS of 250ppm is high, but not exactly off the charts. I wouldn't worry about it if it were my water.
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