Posted: Wed Mar 07, 2018 12:38 pm Post subject: Clay pellets causing tds rise.
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.
Posted: Thu Mar 08, 2018 3:26 pm Post subject: Re: Clay pellets causing tds rise.
I have not used clay gravel myself, or might have I am not sure, but it seems to me that it is very much like dirt. And it keeps on dissolving with the water giving you a spike in TDS. I dont really think you can attribute increase in TDS from the gravel to leaching of minerals. My understanding is that TDS is just dissolved solids. Say if you have a 1mg granule on gravel in a glass of distilled water, and you plant one plant on that 1mg granule(hypothetically), you will have 0ppm but say 0.01mg of sillicates and 0.02mg of calcium available for the plant. Now if you crush that 1mg granule and mix it with water, you'll have, say 100ppm but still 0.02mg of calcium and 0.01mg of silicates.
What is happening in your case I think is that these clay pellets are dissolving in water, OR they need to be washed more thoroughly. The second option seems more likely. In order to curb this in case you cannot remove the pellets now, just top them with thoroughly washed sand.
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