Pentair is one of the most popular filter manufacture in the US. Over the years there have been a number of mergers and acquisitions that have made Pentair one of the biggest players in the pool industry. American Products filters, Purex filters and PacFab filters all fall into the Pentair family of replacement parts. If you have a pool filter by any of the above manufactures you are in the right place. We have a huge selection of replacement filter parts for these filters.