If you use pure quartz mason sand, open the bag and dry it for a few days in a warm/hot dry environment you should not have any moisture problems. I don't and my sand filled speaker stands have been in use for 10 years!
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In the past I've used sterilized sand which I purchased at
Also, I just put together a pair of stands for my mom and
I used pure crushed marble. Simular consistency to sand,
but granular like salt, but the grains are larger than salt, tho still very small.
It was very dry, no moisture like you may get with sand,
and very dense and heavy. I preferred it over the sand.
Also a Home Depot item