Aside from having to install a new filter housing and replumb a few lines to my kitchen, the filter fit good and was an easy install in the housing. My well water tested at 0.012 mg/L before the new filter. Just slightly over the 0.010 mg/L limit. After installing and getting the water tested again, it effectively eliminated all the arsenic, <.0010 mg/L. Very happy with this filter purchase and will buy replacement filters in the future.