Rainbow 25 Sq. Ft. Filter.  Measures: 4-15/16″ (OD) x 13-5/16″ (Length), with 2-1/8″ open holes in both top & bottom end caps.

Commonly used in Rainbow Pressurized 25 Sq. Ft. Filter Canisters.  Can be used with Nature 2 Mineral Purification cartridges, or Leisure Time Spa Minerals cartridges for added Mineral Purification Filtration benefits.  Can be used in pressurized filter canisters with or without an automatic tablet feeder.