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Undergravel or UGF Problem?

Just out of curiosity, I have this question about
undergravel heating.  Wouldn't it be possible for
heated water coming up out of the substrate to bring
up things with it that should probably stay down

For example, say you had jobes sticks down there.  I
would guess having an undergravel filter might cause
the same sort of problem, if indeed it could be one.  

Later, Cavan  --in Pittsburgh

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