Unicel Replacement Filter Cartridge for 75 sf Caldera Spa | C-7479

Unicel C-7479 Replacement Spa Filter Cartridge – 75 Sq Ft (Caldera 33017 Style)

The Unicel C-7479 is a premium 75 sq ft replacement cartridge filter commonly used in select Caldera / Watkins spa filtration systems. It features a top carry handle and a 2" male slip bottom connection for proper seating in compatible filter canisters. Replacing an aged or damaged cartridge helps restore circulation, improve water clarity, and reduce strain on the pump and heater.

Key Features

• 75 sq ft pleated filtration area for strong debris capture and good flow
• Top: semi-circular carry handle for easy removal
• Bottom: 2" male slip fitting for correct alignment/connection in compatible housings
• Durable pleat media and rigid inner core designed for repeated cleanings

Specifications

• Part Number: C-7479
• Filtration Area: 75 sq ft
• Outside Diameter: 7"
• Length: 14-3/4" (cartridge body; handle not included in length measurement)
• Top End Cap: Handle (closed)
• Bottom End Cap: 2" Male Slip
• Pleat Count (typical): 216

Compatible / Replaces

• Caldera / Watkins: 33017 (commonly referenced as “older style” 75 sq ft filter)
• Pleatco: PCD75
• Filbur: FC-3085
• Darlly: 70752
• Baleen: AK-6050
• Aladdin: 17523

When to Replace

• Pleats are torn, frayed, or separating from end caps
• Cartridge won’t clean up well after a deep soak and thorough rinse
• Flow is reduced or pressure rises quickly after cleaning
• End caps are cracked/warped or the core is collapsing

Related Products

• Unicel C-7479 (Shop / Options)
• Pleatco PCD75 (Alternate Cartridge)
• Filbur FC-3085 (Alternate Cartridge)
• Spa Cartridge Filter Cleaner
• Cartridge Cleaning Wand
• Spa Water Test Strips

Maintenance Tips

• Rinse the cartridge regularly (weekly for heavy use) to prevent restriction and keep jets flowing strong.
• Deep clean with a cartridge cleaner to remove oils; rinse thoroughly before reinstalling.
• If scale is present, degrease first, then use a scale treatment (never reverse the order) and rinse well.
• Rotating between two cartridges (one in use, one drying after cleaning) can extend overall filter life and improve performance.