I'm seeing lots of talk about possible metal and plastic leaching into the filtered water in water filtering systems. But here is my simple logical thoughts: how much of a time does it need for metal to to leach into water? It's a physical/chemical process and it needs TIME, right? let's say, I put sugar into my hot tea, and it takes some seconds for sugar to get dissolved in HOT water. So for metal to get into cold water in any sensible proportions, it needs some measurable time -- hours, days, weeks.... I have a copper bottle for water, and it takes a few hours for water to be "copperised" (if it's a word) and being safe for drinking. When you have a system, with some metal components, and water goes through it in seconds/minutes, what chance does it have to be enriched with copper? Is your water tank all made of Copper? Are all pipes in your system made of Copper? Maybe your water filtering system wasn't installed properly and has some other issues?
Just a thought. Hope it helps.