I purchased the GSS2 more than a year ago and love it...The GSS2 takes 2 of the 2"x7" SuperSterasyl filters that have a 535 gallon capacity (each). This will provide you with over 1,000 gallons of premium quality water ( 1 year for a 2-4 person household).
This system has both filters and I need to know when they need replacing.
What is the volume/measure to determine this?
Gravity Filter replacements