• Weight: 4 oz. 

• Width: 7.25" 

• Length: 28.5625" 

• Area: 130 sq. ft. 

• Top Style: 3" Open 

• Bottom Style: 3" Open 

The Filbur FC-1637 is a replacement spa or pool filter cartridge for the Sonfarrel 130 with Step. The FC-1637 spa filters are a polyester-pleated cartridge and cover a surface area of 130 square feet. Spa and swimming pool filters promote water health and safety by working with balanced water chemistry to remove harmful bacteria and other microorganisms. The FC-1637 spa filter cartridges are able to replace the following manufacturer part numbers: Sonfarrel/Martec 2301630, Unicel C-7413, and Aladdin 23001.