BB11 20 oz (591 ml) Filter Inside: Just add water! Replace up to 1,800 Bottles (No bottles to throw away). Each year. Standard 16.9 oz. (500 mL) bottles. Great-tasting water without the waste. Reduce chorine (Taste & odor) and more (See certifications). Stays cold for 24 hours. Filter lasts 2 months (Approximate timing based on 64 oz. (1.89 l) per day). Replace up to 1,800 bottles (standard 16.9 oz (500 ml) bottles) each year. Tasted and certified by the WQA against NSF/ANSI standard 42 for the reduction of the claims specified on the performance data sheet, Made in China of global components.