The PB Pre/Post Reverse Osmosis Filters are the set of PRE and POSTFILTERS for the Pure Blue (PB) reverse osmosis system. It is recommended that these filters be replaced every year to ensure the highest quality filtration.
PLEASE NOTE: These filters are NOT compatible with the Ultra drinking water system. If your system has the word "Ultra" printed on it, and your filters are white in color, these are NOT the correct filters. Your filters can be found here.