QUOTE (doodlehead @ Feb 9 2008, 04:53 PM)

Floating in the top piece?
9If you are filtering because filtered water tastes better, then I could see
an objection. If you are filtering out "little critters" (near microscopic water bugs),
then that might be OK. One option, of course, is to drink seltzer on Shabbos
or prepare a carafe of water beforehand (the practicality of this would depend
on how much water you and your household normally drinks on Shabbos).