OMNIPURE Q5633 WATER FILTER The Q-Series Omnipure Q5633 water filter is easy to install and user friendly. Designed for quick and simple installation with a twist of the wrist. The Omnipure Q5633 water filter is an acid washed granular activated carbon (GAC) 12x40 mesh filter. The Q-Series Q5633 filter improves drinking water and cooking water taste and odor. The Omnipure Q5633 replacement water filter can be used in beverage equipment, reverse osmosis systems, drinking fountains, ice machines, and other point of use applications.