Thanks to everyone who replied to my question about filling the sheath tank. Of the 40-plus replies, most said they do not fill the tank in a laminar flow hood and experience no contamination problems. Many cited extensive cleaning routines and the 0.2 um in-line filter as reasons not to use the hood. A few people DO fill their tanks in the hood, taking the "better-safe-than-sorry" approach. thanks again, Jeff
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