The remarkably clean and carefully crafted aesthetics of the Marley Natural smoked glass bubbler will satisfy you with smooth and cool clouds of smoke. The borosilicate glass bubbler has been engineered with intelligent proportions and practical solutions, like the extra water filtration of its eight-slit percolator stem and a practical splash-and-ash catch. To clean the thick borosilicate glass of the bubbler empty it of all liquids, soak in a mixture of isopropyl alcohol and coarse salt, then rinse well with warm water.