With the Home Water Softener Cartridge, your water becomes softer in the simplest way – and lasts up to 2 months. Installation is easy. Place the softener in combination with this filter cartridge in the DrinkPure Home. Your water will now be softer and filtered. Enhance your drinking experience completely without chemicals. One cartridge lasts for up to 20 days. It must be used in conjunction with a DrinkPure Home filter cartridge.