Built a down tube inside the kettle and placed a copper scrubber pad under the down tube to filter out the hops, hot break, and cold break. Works great. Question though. After boiling strike water I noticed the water was noticeably tinted by the copper scrubber pad. I dumped the water and reboiled another batch, but it was also tinted. My concern: Why did the water get so discolored by the copper ? and are there health concerns ?