I won't buy Starbucks coffee because I can taste the coffee they put in the cup
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Just so you know … that whole house filter doesn't seem like a charcoal filter. It seems like a sediment & particle filter.
It's the chlorine in the water that makes for that metallic taste in coffee. Removing it seems to be all it takes to improve the taste.
@j_garcia
Those charcoal filters, like your Britta, only remove chlorine from water. They cannot remove the minerals that make for hard water. To soften hard water you have to use either a water softener or a de-ionizer filter. Water softeners exchange ions like calcium, magnesium or iron, with sodium which is more soluble. De-ionizer filters are much larger, require regular maintenance, and cost quite a bit more.