If you've ever wondered whether a water filter between your coffee machine and the main supply was worth it have look at the filter above. The green sediment on the outside is copper! The water in the cartridge was the same green colour which suggested the filter was definately worth the installation but we needed to change it more often. With water restrictions in place in our city (Melbourne) and low catchment levels one can only imagine what chemicals are being added to supply "clean" water from the tap. I hope the water in your home is cleaner that the supply in this building! If you're worried I would recommend filtering the whole house and not just the coffee machine.
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