Replacement tank for the Aquasana Whole House Salt-Free Water Conditioner. Our dual tank system is designed to hook up seamlessly with your whole house water filter system or as a standalone descaling system. Aquasana's Salt-Free Water Conditioner is better than just a softener. It won't demineralize your water by chemically reducing minerals from the water nor will it put excess salt waste or chemicals into the water or our environment. Compare to Pelican Water, Express Water, SpringWell Water Filtration Systems, Ne Aqua Systems, Bluonics, Hardless NG, Culligan, APEC Water Systems, iFilters, & More!