Nets that are clogged with dead mosquitoes, spiders, pollen and dust will have an adverse effect on the vacuum's ability (airflow) of your Mosquito Magnet® Defender/Patriot trap and prevent it from working at its best. Start each season with a new Mosquito Magnet® Defender and Patriot Net and replace every 21 days or sooner if necessary. The rigid bag is self-contained, allowing for easy disposal and replacement. Whether constructed with rigid nets or nets with drawstrings, our self-contained nets eliminate any direct contact with the dead insects. Protect your family from mosquitoes and biting insects who may carry serious diseases - keep your Mosquito Magnet® at peak performance with regular replacement of attractants and nets.