Enjoy a sparkling clean swimming pool by keeping your pool filter working its best. Your pool filter is only as good as its filter, so trust the 4-pack of Summer Waves Replacement Type B Pool and Spa Filter Cartridges to capture contaminants and debris in your water. These replacement filter cartridges filter out debris, dirt, and other contaminants thanks to ultra-fine, heavy-duty paper with more pleats than your average pool filter cartridge. This allows them to catch and hold onto fine dirt and sand. Every cartridge only needs to be replaced every 2 weeks, giving you the time to enjoy a refreshing summer all season long. Easily swap out the filter cartridge every 2 weeks, and relax in a debris-free pool. Make sure you keep your pool safe and sparkling clean all season long with the Summer Waves Replacement Type B Pool and Spa Filter Cartridge, now in a convenient value 4-pack.