TDS jump due to clay pellets. - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 03-07-2018, 05:31 AM Thread Starter
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TDS jump due to clay pellets.

I have isolated the issue by testing the clay gravel separately. The tds jumps from 234 ppm to 850 ppm in 10 days. I am talking about burnt clay gravel. The lfs and others vouch for it especially for plants. Now the questions,
What was exactly is being leaches? Silicates, calcium? I would say there are no algae problems.

Is this a cause of worry? Should I acid wash the clay gravel.
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post #2 of 4 (permalink) Old 03-07-2018, 01:50 PM
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Quote:
Originally Posted by vijaydpgc View Post
I have isolated the issue by testing the clay gravel separately. The tds jumps from 234 ppm to 850 ppm in 10 days. I am talking about burnt clay gravel. The lfs and others vouch for it especially for plants. Now the questions,
What was exactly is being leaches? Silicates, calcium? I would say there are no algae problems.

Is this a cause of worry? Should I acid wash the clay gravel.
Just change a portion of the water 50 % every 5 or 6 days and note TDS before and after.
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post #3 of 4 (permalink) Old 03-07-2018, 02:28 PM
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You could measure you GH & KH to see if they increase as TDS rises, this would tell you if there's calcium(among other things)/carbonate leaching from the clay. At 850ppm, you're WAY up there.
Like roadmaster said, keep doing water changes, see if the TDS rise slows down after a few. Did you rinse the substrate at all? Is it supposed to be rinsed?
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post #4 of 4 (permalink) Old 03-08-2018, 01:58 AM Thread Starter
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Thank You Roadmaster and mgeorges. 850 is way up there. I initially thought of adding inert gravel top off the mineralized soil layer at the bottom. But I was suggested clay pellets to be a better option as it was good for the plants to root in, high CEC, allowing stuff to get into the bottom layer etc. And then when I completed the setup I realized that it is leaching badly.

And yes, I rinsed it very well for two days before adding it. The water and is extremely clear btw. To remove all the plants and replace the substrate would be a painful procedure. But if it has to be done, it has to be done.
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