Considering what Silica is, you can pulverize clear glass and use it for a flux. That way you don't need to be concerned about dirt and impurities.
Don't add metal filings??!!
That would just burn up, oxidize, and add to the problem you're trying to avoid - scale!
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When the last deer disappears into the morning mist,
When the last elk vanishes from the hills,
When the last buffalo falls on the plains,
I will hunt mice for I am a hunter and I must have my freedom.
Chief Joseph, Nez Perce
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