Product review (5 stars): A Must-Have For Anyone With Hard Water
I can really tell a difference when I use the Venta Airwasher Water Treatment Additive. It helps prevent mineral build-up inside my Venta Airwasher. We have hard water, so this additive is a must-have if I am going to use the Venta. It saves me so much time when I go to clean the inside of the machine because there isn't anything built up on it.

I use the product every 10 to 14 days as recommended. One 35 ounce bottle should last me around 6 months. I will definitely buy more as needed.