The lifetime of a filter depends on several variables,multi-cap including:

• Composition of the mobile phase
• Flow rate
• Ambient temperature: a higher temperature leads to the increased vapor pressure of the volatile compound

The theoretical lifetime of an exhaust filter based on the flow rate can be shown as:

*Based on results of our tests (water/organics = 50/50; flow rate 1.0 ml/min during the day, 0.5 ml/min overnight, 0.1 ml/min during weekends).