The latest product from Pristine, H2OK water cooler cleaner, is a quick, convenient and cost effective way to clean personal and office water cooler equipment. One treatment with H2OK is good for three months to refresh and remove any bacteria that cause foul odors or tastes. Simply add H2OK to an empty cooler, wait 15 minutes, drain the system and refill with drinking water. The H2OK system can also be used to clean water filters, water bottles, water bags, carboys and camel packs.