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Re: Driftwood Weights

If your water maintains a pH higher than 7, lead is probably safe, but
controversial.  If you pH drops to 7 or below, definitely don't use

I have used lead-free solder to weigh down driftwood.  It is a 95% tin
alloy that is nontoxic.  You could also buy bismuth shotgun pellets from
a gun shop (reloading supplies), as they are even denser than lead but
really expensive.