For use with Aquatic Life RO Buddie Reverse Osmosis Units.Now filled with MBD-30, a high quality resin mixture for direct purification of water.The residuals produce average conductivity values of about 0.1us/ cm for a major portion of the service run which may be extended depending up on the final acceptable water quality - Clear cylinder housing with one white connexion port on each end - Blue resin visible through the cylinder - Includes Clips for mounting to Aquatic Life RO Buddie and RO Junior.