GH went up with STS - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 06-28-2013, 07:47 PM Thread Starter
Algae Grower
 
Join Date: Jun 2013
Location: Central Florida
Posts: 21
GH went up with STS

OK. I bought Safe-T-Sorb because I wanted to lower my KH and GH.

TAP:
KH:161 ppm (9)
GH:161 ppm (9)

Tank with STS:
KH: 161 ppm (9)
GH: 214ppm (12)

Bucket with STS and tap water:
KH: 161ppm (9)
GH: 214 (12)

So it's not anything in the tank. What's going on?
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post #2 of 7 (permalink) Old 06-29-2013, 12:57 PM
Obsessed? Maybe
 
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Location: Louisville, KY
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The KH absorption of STS is minimal and lasts for a very short period of time. It's not an aquatic substrate (we just use it for that) and each batch will actually vary from another. If you want a substrate that buffers, you'll have to buy a product specifically developed to do that like ADA Aquasoil.

Since it's calcined clay and dusty, I'm guessing you rinsed it quite heavily? That's going to cause it to break down a bit.

If you give it a couple days to settle into your tank, particulate matter in the water will eventually settle.
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post #3 of 7 (permalink) Old 06-29-2013, 04:26 PM Thread Starter
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Location: Central Florida
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That's the thing. kH didn't budge at all and gH went up quite a bit.
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post #4 of 7 (permalink) Old 06-29-2013, 04:30 PM
Obsessed? Maybe
 
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GH is essentially calcium and magnesium. So it makes sense that calcined clay would increase your GH.

Give the tank time to settle.
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post #5 of 7 (permalink) Old 06-30-2013, 02:18 AM
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Odd.
The KH dropped to zero in my tank, and the GH stayed the same.
The lowered KH allowed the pH to drop, too.
I also suspect this material removed the sodium hydroxide the water company adds to the tap water.
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post #6 of 7 (permalink) Old 07-01-2013, 06:16 PM
Algae Grower
 
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Location: TX, USA
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I used turface in my tank, it droped the KH to 3 from 9, and PH from 8.2 to 6.4, and stayed there.
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post #7 of 7 (permalink) Old 07-01-2013, 07:53 PM Thread Starter
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Location: Central Florida
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Hmm. I may try the Turface.
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