Now available in a convenient bonus cartridge replacement package is the 7 Stage & Alka-Pi filter cartridges. This can be a cost effective way to maintain your water filtration system- optimizing performance and prolonging the lifespan of the filtration system itself. In this package you receive the benefits of a fresh 7 Stage filter to rid your water supply of the sediments, dirt, silt, bacteria and chemicals along with the Alka-Pi filter, which focuses on balancing the pH levels in your water and bringing it to an alkaline state. Despite the 7 Stage & Alka-Pi Bonus Replacement Cartridge set being an economically conscious decision, it can also optimize the performance of the filtration system itself while it is protecting your water supply. Your water supply will be completely ionized, lead and toxin-free, as well as safe for bathing and drinking alike.