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Re: red flint filter sand
Kevin writes:
> I hold in my hands a 5 lb sample bag of "red flint filter sand #20" from a
> national building supply company. This place supplies Estes, one of the
> most popular brands at the LFS, with their raw gravel. I have the
> opportunity to get major quantities at what seems to be a fairly cheap bulk
> price ($0.25 per pound, including shipping). It perfectly bridges the gap
> between a coarse sand and a fine gravel. However, it's not really red;
it's
> a mix of gray, red, and white rounded pebbles, 1-2 mm in diameter. It
> didn't react with vinegar. This is the raw product before it gets painted
> and polished by Estes. Any thoughts on what this is and it's usefullness
as
> a substrate? Thanks, Kevin
If it is non-reactive with vinegar, then it is probaly safe for aquarium use.
To make sure, try pouring a little muriatic acid on it. That is much
stroger than vinegar and will let you know for sure. I'd appreciate it if
you could email me off-list with the name and contact info of this company.
Bob Dixon
idmiamibob at aol_com