The Swimming Pool Filter is made from heavy duty polyester and is designed to last far longer than cheaper alternatives, while having more pleats to improve filtering capacity. filters are made in the USA for the highest possible quality, allowing you to buy with confidence.Note: OEM 4 oz. product has black end caps and 3 oz. product has slate blue end caps. Part number for this product formerly 42 2370 08, 42 2888 03 R, and 42 3536 07 R.replacement filter grids are recognized as the best grid replacements in the industry. They have received numerous awards year after year for their performance and quality of products. We are an Authorized Dealer. An appropriate cleaning schedule will both help the performance of the filter and keep it from breaking for longer periods of time. However, it is not a permanent part and standard use will result in the need for a replacement. Make sure you go with the highest quality standard of replacement: Unicel.