Unicel C-4401 Replacement Filter Cartridge | 35 Sq. Ft. | 4 5/8" | 2-Pack | Fits Pentair DSF, Waterway Skim Filter & More

The Unicel C-4401 is a 4000 Series replacement filter cartridge built with 158 pleats of heavy-duty 4 oz. Reemay 2040 polyester media, delivering 35 sq. ft. of filter area per cartridge. The high pleat count maximizes surface area in a compact 4 5/8" form factor, providing thorough filtration for spa and above-ground pool applications. This listing includes 2 cartridges — sold as a set.

⚠️ IMPORTANT: Sundance® Spa Owners — Dual Cartridge System
Certain Sundance® spa filter systems require both a C-4401 (inner, 35 sq. ft.) and a C-4405 (outer, 10 sq. ft.) for a complete 45 sq. ft. filter service. These are two different cartridges — this listing covers the C-4401 inner cartridge only. Sundance OEM part 6000-134 cross-references to the C-4405, not this cartridge. Need the outer cartridge? View the Unicel C-4405 here.

Specifications

Filter Area	35 sq. ft.
Length	4 5/8"
Outer Diameter	4 15/16"
Top Inner Diameter	2 1/8"
Bottom Inner Diameter	2 1/8"
Material	4 oz. Reemay 2040
Pleat Count	158
Top Cap: Open	Bottom Cap: Open

Note from Unicel: Sold as a set of 2 cartridges with stick handle.

Fits into:

Also known as: C4401