The Unicel C-4335 (Pentair Rainbow Dynamic 35) is a 35 square foot replacement cartridge designed for Pentair and Rainbow Dynamic IV filtration systems as well as compatible top-load inline setups. Built with 219 pleats of durable polyester media, it captures fine particles to keep pool and spa water clean and balanced. Measuring 9¼″ in length with a 4 15⁄16″ outer diameter and 2 1⁄8″ center openings, this cartridge is precision-engineered to meet or exceed OEM standards. Offering reliable water clarity and longer cleaning intervals, it’s an ideal choice for maintaining strong system performance.
Highlights
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High Filtration Area: Provides 35 square feet of filtration surface with 219 pleats, delivering thorough debris capture and extended service between cleanings.
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Exact OEM Fitment: Features 2 1⁄8″ inner diameter openings and 9¼″ length for a perfect match to Rainbow Dynamic 35, Pentair, and Waterway cartridge housings.
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Durable Polyester Media: Constructed with tough, chemical-resistant polyester material and sturdy end caps designed to withstand repeated cleanings and long-term use.
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Wide Compatibility: Direct replacement for several OEM part numbers, including Rainbow 17-2482, Pentair R173431, Waterway 817-3501, Filbur FC-2385, and Pleatco PRB35-IN.
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Enhanced Water Quality: Improves circulation efficiency, helps reduce chemical consumption, and keeps pool or spa water crystal clear for longer periods.
Additional Info
This section covers the Unicel C-4335, a 35 sq. ft. cartridge for Pentair Rainbow Dynamic 35 and similar systems. Learn about sizing, compatibility, and how to confirm fitment in store.
Cartridge Dimensions and Fitment
The C-4335 measures 9¼″ long, 4 15⁄16″ in diameter, and includes 2 1⁄8″ center openings. It matches the Rainbow Dynamic 35 and related housings exactly.
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When to Replace the Cartridge
Replace cartridges when pressure rises 8–10 psi above clean pressure or water clarity drops. C-4335 provides strong flow and reliable debris capture.
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Buying C-4335 In Store
Bring your old cartridge for comparison. Local staff can verify part numbers such as Pentair R173431 and Pleatco PRB35-IN against the Unicel C-4335.
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