The idea to use a water filter for the coffee machine revealed itself by offering this product at Amazon. However, I can not detect any change in the taste of coffee. As pure water a difference can be seen, but I bet more on the addition of magnesium as the filter to another improvement of the water. Hygienic is a water filter, a nightmare - after a maximum of 3-4 days, I no longer consider it to be clean. The proposed decoction of plastic filter is indeed a good idea, but that all the plastic is still in the process in the plastic, may believe whoever wants.