To change a PUR water filter, detach the outer casing from the faucet, unscrew the lid, and switch the old filter out for a new one. Once the new filter is in place, replace the lid of the casing, and re-attach the filter to the faucet.
PUR faucet filters are designed for easy maintenance. The outer filter casing has a small LED light that flashes when the filter is in use. When the filter is fully functional, the light flashes green. When the filter should be changed soon, the light is yellow. When the filter is due for a change, the light flashes red. When replacing the filter, ensure that the new filter is placed upright in the casing. Dispose the old filter in the regular garbage.