TDS (Total Dissolved Solids) & It's importance in Shrimp Rearing - Page 2 - The Planted Tank Forum
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post #16 of 124 (permalink) Old 09-07-2011, 11:00 PM
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post #17 of 124 (permalink) Old 09-07-2011, 11:18 PM
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I use the ones in the OP, works good
Does it come with a calibration source liquid? Do I need to buy a meter with one or can you easily make your own?

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post #18 of 124 (permalink) Old 09-07-2011, 11:23 PM
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Total dissolved solids
More precisely: The sum of almost all ions, organic molecules and floating particles in your water in ppm. It's really a shot gun measurement that imo isn't very useful.
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post #19 of 124 (permalink) Old 09-07-2011, 11:26 PM
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More precisely: The sum of almost all ions, organic molecules and floating particles in your water in ppm. It's really a shot gun measurement that imo isn't very useful.
All ions that conduct electricity. It's useful if you start with pure RO and know exactly what you are putting in.

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post #20 of 124 (permalink) Old 09-07-2011, 11:31 PM
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post #21 of 124 (permalink) Old 09-07-2011, 11:38 PM
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Originally Posted by Jeffww View Post
More precisely: The sum of almost all ions, organic molecules and floating particles in your water in ppm. It's really a shot gun measurement that imo isn't very useful.
Do you know of anything more useful on indicating water purity?
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post #22 of 124 (permalink) Old 09-07-2011, 11:39 PM
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Originally Posted by Jeffww View Post
More precisely: The sum of almost all ions, organic molecules and floating particles in your water in ppm. It's really a shot gun measurement that imo isn't very useful.
I think it is a more useful measurement than pH, Kh, or GH. It is a farely good indication of the cleanliness of your tank. Particularly if you know your starting point.

It is a good measurement for shrimp too.
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post #23 of 124 (permalink) Old 09-07-2011, 11:41 PM
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So it is possible to have low kh and gh but high TDS? Or are those somehow intertwined?
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post #24 of 124 (permalink) Old 09-07-2011, 11:42 PM
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Originally Posted by GeToChKn View Post
Does it come with a calibration source liquid? Do I need to buy a meter with one or can you easily make your own?
This one have a calibrated potentiometer in the back with label "Calibrate with NaCl".
I'm sure you can get calibration solution online and just adjust the pot in the back. For $17, it do not come with the solution.
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post #25 of 124 (permalink) Old 09-07-2011, 11:46 PM
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Originally Posted by jkan0228 View Post
So it is possible to have low kh and gh but high TDS? Or are those somehow intertwined?
yes was the answer i was given in previous post. since my test kits also given this answer in my post.
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post #26 of 124 (permalink) Old 09-07-2011, 11:50 PM
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Is there a calculator similar to the ppm to degree conversion of kh and gh?
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post #27 of 124 (permalink) Old 09-07-2011, 11:50 PM
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Quote:
Originally Posted by mordalphus View Post
Yes, tds could be "cleanliness", ro water has close to zero solids disolved in it. Water with nitrates and phosphorus has more solids dissolved.

Reconstituted ro water measured with a tds meter will yield a ppm of hardness, only because you have only the hardener dissolved into the water
good answer, i agree with you, i can start with 87 tds in my tank and it will make its way up to 150 within next day if measured by tds meter. i do add the EI dosing on top of that.
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post #28 of 124 (permalink) Old 09-07-2011, 11:53 PM
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Originally Posted by jkan0228 View Post
Is there a calculator similar to the ppm to degree conversion of kh and gh?
http://www.csgnetwork.com/directhwppmcvt.html

KH and GH are measured in same numbers, 1dgh is 17ppm of either one.

Note: calc is little bit wrong, am sure you will find out when you use it, other than that it work fine.
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post #29 of 124 (permalink) Old 09-07-2011, 11:57 PM
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Quote:
Originally Posted by happi View Post
http://www.csgnetwork.com/directhwppmcvt.html

KH and GH are measured in same numbers, 1dgh is 17ppm of either one.
Yea I know but is there a calculator for TDS?
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post #30 of 124 (permalink) Old 09-08-2011, 12:06 AM
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Originally Posted by jkan0228 View Post
Yea I know but is there a calculator for TDS?
TDS can change from time to time and i dont think there is any calc for it.

my tank water read .5KH and 5GH 5x17= 85tds and the tds increases by it self or after dosing some ferts but 5Gh remain the same or become 6Gh if am dosing Ca and Mg, right now tds is reading 200ppm+ with the meter but API reads 6dgh
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