The Filbur FC-3129 is a compatible replacement for the folllowing water filters:
The FC-3129 Big Daddy Pre-Filter Pool & Spa Filter is a replacement pool filter that measures 4 5/16 inches x 13 1/2 inches. This compatible Big Daddy pre-filter features a closed top and bottom hose for pre-filtration in swimming pools and spas. This disposable pre-filter spa filter is 90% efficient at removing contaminants from water, such as dirt, sediment, rust calcium, iron, and copper.
FC-3129 Big Daddy Pre-Filter Pool & Spa Filter specifications: