Visit this site https://twitter.com/FilteWater/ for more information on Portable Water Filter. One simple method to choose if it is time to use a Portable Water Filter is if the sink starts to loose water pressure; the sink will loose water pressure because the Portable Water Filter is obstructed with dirt or other sediments. Depending on the microns the filter is able to stay out of the water some devices may be rinsed and recycled for a time; normally if a filter stops less than 5 microns from leaving the filter, rinsing out the filter is worthless. follow us : http://waterfiltersystemreviews.blogspot.com/