For the Freemax Mesh Pro, new mesh material and structure is implementd and the tests show that double mesh coil and triple mesh coil can last 2-3 longer than single mesh coil, quates from our test team, the life of the double and triple mesh coil is about 200ml of normal sweet-liquid with no coolada (about 40 full tanks) and 100ml of if you use sweet or cool liquid (about 20 full tanks). After that, you can still use the coil but the flavor will be not that pure as new.