(Bubble clogs are prevalent to pitcher filters; Brita has also responded to the issue by including vents.) If your filter seems to have clogged, Pur suggests getting rid of it, turning it upside down, and shaking it for the few seconds to compact the filter media and eliminate the bubbles. https://andersontujud.aboutyoublog.com/21826726/not-known-details-about-water-filter-for-skin