An important thing to remember about well water condition is that it can and does change. What this also means is the water filtration system you've paid for and have serviced regularly, may no longer be effective or may no longer be necessary. This could also means you may now need fiktratikn and conditioning that you hadn't previously needed.I recommend an annual comprehensive re-test/analysis of wells and springs to identify any changes in water quality and conditions.
Changes can range from "no changes to dramatic changes". Even a minimal change in iron levels or harness can mean adjustments to a filtration system. Protect your investment and the health of your family.