The use of filters is a personal one. Some homes may experience particular problems or specific concerns that impact their decision to use a filter. It is important to note that manufacturer specifications are based on generic conditions and are not based on actual water quality in the MWRA service area. Since MWRA is an unfiltered surface water supply, it is likely that more frequent filter changes will be required. In particular, during certain times of the year, the source water reservoirs experience algae blooms and these can result in rapid fouling of filters. Also, depending on local conditions, iron may be elevated and this will result in more rapid fouling of the filter. It is important to properly maintain your filter. To reduce required filter changes, you may want to filter only the drinking water, not all the water entering the house.