The PLFPRB50-IN Spa Filter by PoolPure is a high-quality filter cartridge designed for spas. Made in the United States, this model is compatible with Pleatco PRB50-IN, PRB50IN, and Unicel C-4950 filters. This 2-pack ensures that you have a steady supply of clean and refreshing water for your spa, allowing you to relax and enjoy the benefits of your spa experience without worrying about maintaining your filter cartridges. With the PoolPure brand, you can trust in the quality and durability of their products for your spa needs.