Before using filters, I would evaluate water quality to assess the situation. A researcher in our neighborhood collected water samples from houses in the same area supplied by the same water source. Her results were surprising; almost all houses in her sample that used water filtration had worse water quality than houses without filtration systems, except for one house. She concluded that it is probably due to infrequent filter replacement or a very long duration between replacements causing bacterial growth, resulting in worse water quality than those without filtration. So I guess replacing the filters at the recommended intervals is necessary if you use any filtration systems.