The Filter Cartridge VI for Lay Z helps keep the water in your pool and spa clean. It is easy to use and works with the heating and massage water pump. This filter cartridge is easy to clean and is compatible with the following inflatable spas: Lay Z Spa Vegas, Palm Springs, and Monaco. With the Bestway Filter Cartridge VI for Lay Z, you can filter the water in your spa and keep it clean and refreshing all season long. The package includes two filter cartridges.