Consider Wholesale Supply, Inc. your replacement water filter warehouse! We keep the top name brand replacement filters in stock, and we offer the most competitive pricing you will find. Based on average water usage, the industry says a water filter's life expectancy is 6 months. Of course, if the water filtration system is being used more often, the filter will expire sooner. The great news is Wholesale Supply, Inc. offers a free Filter Replacement Reminder Service! We will send you a friendly reminder 6 months after your order, so you don't have to worry about keeping up with filter change out due dates!