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iAVs sand has to be inert. What does that mean?
When we say that sand is ‘inert’, we mean it doesn’t react with water. To check this, we take a small sample of the sand and mix it with regular vinegar. If we see bubbles after a few seconds, it means the sand has carbonates in it. This is a problem because it would make it hard to keep the right pH level, so the sand isn’t good for iAVs.
There may be other impurities in the sand that influence pH – so a simple pH test is also required. Sand itself doesn’t have a pH, but when we talk about testing the pH of sand, we’re actually testing the pH of the water solution in contact with the sand particles. To test the pH of sand, we mix it with water or a neutral solution. This creates a slurry where any soluble components in the sand can dissolve. It’s this solution that we actually test for pH. A pH close to neutral (7) usually indicates relatively pure sand.
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