Do you know that a study conducted by American University found that refrigerator filters are just as effective in removing contaminants? If you replace the filter on a regular basis as recommended by the manufacturer, refrigerator water filters will operate brilliantly. They are equally effective at removing contaminants as large water filters. Your appliance's owner's handbook should provide instructions on how regularly to change your water filter, which should be done at least once every six months. This will ensure that your water remains clean, transparent, healthy, and delicious, just like with huge water filters.