Activated Carbon Rod Filter Replacement CF Water Filter, Applicable to Thereye ER-WP02 Reverse Osmosis Water Filter System Size: 2.3"X2.3"X11" Service Life: 6 months (The actual service life will vary depending on the water quality in your area and how it is used.) Easy to Install: Rotary lift to remove, rotary press to install Activated Carbon Rod Filter Replacement CF Water Filter, Applicable to Thereye ER-WP02 Reverse Osmosis Water Filter System