Fluoborate is not a completely stable compound, and therefore a small amount
of HF, and Boric Acid always is present as well.  (This is why they usually
have a slug of Boric Acid in the Fluoboric, to react with any HF released, to
keep the level down.)  Stainless Steel is not real compatible with HF, even
low levels, so I would recommend the carbon baskets.

Rudy Sedlak
RD Chemical Company

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