I have had this unit for perhaps 10 years, finding replacement filters has become a problem, but they are available at a much higher cost. Leaks after filter replacement has always been an issue. The wrench itself does not work satisfactorily and I have to remove the entire filter housing and place it in a vice then beat the wrench with a hammer to get it loosened or tightened. In addition , when I take out the old filter at six month intervals I find the inside of the housing has traces of slime and mold - this is not good, and thorough washing and a final bleach rinse is necessary before inserting the replacement filter.