The HydroLogic Stealth RO150/300 Membrane replaces the one that comes packaged with the HydroLogic Stealth RO150 and RO300 reverse osmosis water filtration systems.
There are two indications as to when to change your membranes. 1. Test the RO and source/inlet water to see what percentage of the inlet water’s PPM the 150 ™ is filtering out (rejection %). You should see approximately 98% of the inlet PPM’s being removed when the membrane is new. If the rejection % falls under an acceptable level (typically 90%) it’s time to change the membrane. 2. When the flow rate of the product water slows down significantly. This can also happen if your pre-filters are clogged. If you change your pre-filters and the product water still flows slowly then it’s an indication you need a new membrane. When it doubt contact Hydro-Logic.