RO reverse osmosis filters need replacing?
Any water filter will need to be replaced with a new one eventually. This is because the filter medium gets clogged from the particles it was designed to capture. It is best to check the replacement schedule according to the filter manufacturer. A good guess is roughly every 3-5 months if the date hasn't been written on the filter case.   There are several filters available and each is specific for according to what needs to be removed from the water. There are also "all-in-one" type filters that can remove several maladies if needed. You can also upgrade your R.O filter by adding-on additional cartridges for additional filters. When the new filter has been installed and checked for leaks allow the system to flush any factory residuals by running the water for several minutes before using the water for ingesting.