Thank you for the great question. We see this question a lot, the filter is not required, it is only an added saftey meassure to protect against calcium or lime build up. If you feel your water quality is very good, you might not need it but is suggested as an extra meassure. A filter like that should be replaced per the manufacturers suggested time frames to keep from stopping flow of water. If your not going to use the filter, just remember to keep on a strict descaling cycle of every 2 to 3 months depending usage.