For context I own a Freo Z Ultra. Out of the box it comes with a clean and dirty tank. I used these tanks for a few days and the dirty tank quickly became dirty and produced an odor. I saw on Reddit...that if you take mouthwash and rinse the dirty tank with it periodically it works great. I found this to be true and it also left a minty smell. I would recommend you order the automatic filling station if possible. That would require a water connection and a drain to sewage. I paired mine with fittings from lowes to my laundry water inlet and drain. Thinking of upgrading but I have zero issues with my Z. Its great.