The Wowreed 2 Pack Spa Filter 04036 is a pool filter cartridge compatible with models such as C-4325 PA225 CX225RE C225 FC-1220. Made for easy installation, this filter is suitable for hot tubs and is designed with a height of 11 7/8" and a length of 4 5/8". It is compatible with brands like Filbur, Unicel, and Hatward, providing clean and clear water for your pool or spa. Made in China, this filter ensures a refreshing swimming experience for you and your family.