Cartridge record

Unicel C-6650

Name: Unicel C-6650 filter cartridge
Brand: Unicel
SKU: C-6650

Also sold asPleatco PSD50Filbur FC-2725

cross-checked against 2 sources

Verified specifications

The selected value is shown first. Expand any row to compare the source values retained by the dataset.

Cartridge specifications
Outside diameter	6-15/16" Source values unicel 6-15/16" pleatco 7"
Length	19-5/8" Source values unicel 19-5/8" pleatco 19-3/4"
Top cap	2-1/16" / open Source values unicel 2-1/16" / open pleatco 2 1/16
Bottom cap	2-1/16" / open Source values unicel 2-1/16" / open pleatco 2 1/16
Pleats	110 Source values unicel 110
Filter area	50 sq ft Source values unicel 50 pleatco 50
Media weight	4 oz Source values unicel 4 pleatco 3

Match the complete printed string. Similar-looking part numbers can describe different end caps or lengths.

Cross-reference equivalents
Brand	Part number	Verification
Unicel	C-6650	cross-checked against 2 sources
Pleatco	PSD50	single-source
Filbur	FC-2725	single-source

Fitments are source-attributed. Confirm the housing model and cartridge measurements before ordering.

Filter and spa fitments
Brand	Model	OEM part	Source
Sundance Spas	Sundance 50	—	pleatco single-source

Records with the same outside diameter and a different length appear first, followed by the closest diameters. End-cap details still need to match.

6-15/16" × 19-3/8"

6-15/16" × 17-5/8"

6-15/16" × 22-3/8"

6-15/16" × 29-3/8"

7" × 19-3/4"

Outbound retailer searches are provided for convenience; Pool Filter Lab is not the seller.