PUR Each PUR water filter is certified to reduce mercury and certain industrial pollutants as well as reduce chlorine (taste and odour) and more. The filter lasts up to 2 months and gives you 40 gallons (or 640 8oz cups) of cleaner, great-tasting water. PUR’s superior filter technology uses activated carbon and ion exchange media and is certified to reduce 2x more contaminants than Brita's leading pitcher filter. The dispenser has a slim, space-saving design that fits easily in the fridge. Large 30 Cup Capacity Dispenser.