Cemex sand high PH - The Planted Tank Forum
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post #1 of 8 (permalink) Old 06-14-2019, 06:21 AM Thread Starter
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Cemex sand high PH

Hi everyone, I have recently bought some 2/12 mesh Cemex sand. I put some in a bucket of water and left it for three days. When I tested the water PH it rose from 7 (my tap water PH) to about 7.6 😞
Will this effect last forever or will it wear out with time? Should I discard the sand or is there anyway to make it work? I really like this sand and had to drive far away to get it.
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post #2 of 8 (permalink) Old 06-14-2019, 07:56 AM
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Looking at data sheet looks good to me. Pretty sure your PH rise is mostly from natural degassing of tap to atmosphere. What does just tap do alone when you let it set for 3 days?

Itís mostly silica based, less than 1% is Ca and Mg. But that will effect GH mostly.

https://www.cemexusa.com/documents/2...4-bb27171f3edc

To fine a sand for my tastes.
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post #3 of 8 (permalink) Old 06-14-2019, 03:37 PM Thread Starter
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Hi DaveKS, thank you for the reply.
I've rinsed the sand this morning and added tap water again to do another test.
I've also filled another bucket with tap water only and will check the PH regularly to see how it will behave.

Last edited by [email protected]; 06-14-2019 at 10:53 PM. Reason: update
 
post #4 of 8 (permalink) Old 06-15-2019, 05:46 AM
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If it makes ya feel any better my well water goes from 6.5 out of the tap to about 8.0 once degassed.

Do you have KH and GH tests by chance? I would check these and be more concerned with that then PH unless you do find out its the sand causing it.

I have to use a GH booster for mine since its about 1 drop out of the well. What I maintain in both tanks is KH-4, GH-4 or 5, PH 8. My RCS and cories are always making babies and pretty sure my CPDs are giving it a shot as well. I also have ember tetras, OTOs, Nerites which are doing good and seem healthy.
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post #5 of 8 (permalink) Old 06-15-2019, 07:42 PM Thread Starter
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So, after 24 hrs the PH rose from 7 to 7.4 in the bucket with clean water and in the bucket with sand. The results are similar... Huh... 😄

I purchased a Gh Kh test kit yesterday, waiting for delivery.
post #6 of 8 (permalink) Old 06-16-2019, 04:50 AM
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Quote:
Originally Posted by [email protected] View Post
So, after 24 hrs the PH rose from 7 to 7.4 in the bucket with clean water and in the bucket with sand. The results are similar... Huh... 😄

I purchased a Gh Kh test kit yesterday, waiting for delivery.

Thats good, atleast in the respect that you know the sand isnt causing any fluctuation. Thats not a bad rise anyhow IMHO. Alot better then mine.
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post #7 of 8 (permalink) Old 06-16-2019, 07:26 PM Thread Starter
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I received my API KH & GH test kit.

Using tap water right out of the crane it took 7 drops of GH test solution to change the color of the water.

The KH test also took 7 drops of KH test solution to change the color of the water.

According to the chart, 7 drops = 125.3 ppm/7dKH

Is this good or bad?

Regarding my initial PH test of tap water. When doing the test I used water from my kitchen crane, which has aerator. Now that I think about it, using water from an aerated crane is a bad idea because it mixes the water with oxygen and CO2 from atmosphere. So in my understanding, the most accurate PH test will be done when using degaussed tap water? How long should I live the water in a bucket for degaussing before doing a test?
post #8 of 8 (permalink) Old 06-16-2019, 10:31 PM
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I like to leave tap water out for 24 hours and then test pH and KH.

I prefer to use a clean glass container though to avoid any potential for something leaching out of a plastic container, even a fish bucket.

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