The Guardian Whole House Water Filter is capable of filtering up to 1,500,000 gallons, and features three stages of water filtration. The tank holds a large amount of water filtration carbon media, increasing the overall performance and lifespan of the filter. When it comes time to replace the media, every 5-10 years, simply replace the media inside the tank, no need to replace the entire tank. The system requires no electricity and is suitable for households with 2-4 bathrooms.