i have a braun coffee filter which i use to remove traces of salt water from brine shrimp (which i feed my hydra with). i know already that copper or any other metallic element has a negative effect on hydra and various other metazoan creatures, and it recently came to my attention that my filter might be made of copper. for any lovers of braun coffee, do you know if the company uses copper to make their filters? note: the filter is a gloden brownish color, very resemblant of copper. thanx for any help!