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Jim Wolford wrote:
>Aug. 20, 2007 -
>
>(also a bacterial scum
>covered the surface of the pond, whose surface was protected from the wind),
>
Hi Jim, Aug 21, 2007
How do you distinguish between bacterial scum on the one hand and
general purpose pond scum (spores, pollen, fragments of hydrophobic
materials, algae...) on the other ?
DW, Kentville
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