The replacement cartridge for the Aquasana 20 in. Salt-Free Water Conditioner for Tankless Water Heaters. Protect your home and plumbing from the adverse effects of scale buildup and extend the life of your washing machine, water heater, dishwasher and other appliances. Unlike salt-based conditioners, the Aquasana Whole House Salt-Free Water Conditioner won’t demineralize your water by chemically removing minerals nor will it put excess salt or chemical waste into our environment. Aquasana uses advanced SCM salt-free technology to naturally and safely reduce scale buildup in hard water without the use of salt or chemicals.

• Extends life of tankless water heaters, pipes and appliances by reducing harmful effects of scale buildup
• Low maintenance – lasts 2 years and doesn’t require heavy bags of salt for replacement
• Does not require electricity, drainage for wastewater, or complicated salt replacement
• Replacement filter for the THD-AS20 aquasana 20 in. Salt-free water conditioner for tankless water heaters (Internet #205477661)