C-4305 Unicel 50 Sq. Feet Cal Spa/Martec Filter

The Unicel C-4305 filter is a replacement cartridge for spas and hot tubs. It is designed with 193 pleats of durable, spun-bonded polyester material and has a 50-square-foot filtration area to trap debris and improve water clarity. 

Specifications:

• Dimensions: 4-15/16 inches in diameter and 14-7/8 inches in length.
• Top opening: 2-1/8 inches, open.
• Bottom opening: 2-1/8 inches, open.
• Filtration area: 50 square feet.
• Pleat count: 193.
• Filter media: 3-ounce Reemay 2033 polyester. 

Compatible spas:

The C-4305 is compatible with several spa brands and models: 

• Cal Spas
• Martec
• Sundance Spas (specifically the 1994 Suntub)
• Sonfarrel
• Advantage Mfg 

Cross-reference replacements

Equivalent filters from other brands that replace the Unicel C-4305 include: 

• Pleatco: PMT50
• Filbur: FC-1630
• Filters Fast®: FF-1630