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You are here: Home > Hot Tub Filters by Size > 3" Diameter Hot Tub Filters
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Filter Range: 3" OD x 0-4" Length Filter Range: 3" OD x 8-10" Length Filter Range: 3" OD x 14-16" Length
Hot Tub Filters by Size
From the above sub-category list select the outer estimated diameter of your filter.
You can browse the filters listed or to drill down further by selecting the length grouping your filter falls within.
Compare your filters end-caps and select the correct replacement hot tub or spa filter.

Not sure how to measure your filter?
Watch the below Pleatco engineer's How to Measure a Hot Tub Filter Video guide.

Have a hot tub or spa filter part number?
Use the above search field if you know the Pleatco, Unicel, Filbur, Master Spa or Baleen number.

Find Hot Tub Filter by Spa Manufacture.
One other way to find your filter is to select the Hot Tub Filters category where we list filters by manufacturer.

All About Spas Replacement Hot Tub and Spa Filter Help.
You can always call us at 888.915.9919 for expert help to find the right filter so you can relax.


How to Measure a Filter Cartridge

Quick tutorial on How to Identify your filter cartridge by measuring or by product number.
These two methods can help you to easily find a replacement filter cartridge for your hot tub or spa regardless of manufacturer.
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Replacement Hot Tub Filter Replacement Hot Tub Filter Replacement Hot Tub Filter
Twin Pack 2 sq. ft. Intex Type "E" #M1  

Replacement for Hot Tub Filter numbers Pleatco # PIN3PAIR Unicel # C-3302 Filbur # FC-3751  

OD 3-1/8" Length 3-11/16" Top ID 1-1/8" Bottom ID 1-1/8"
2 sq. ft. Aqua Leisure  

Replacement for Hot Tub Filter numbers Pleatco # N/A Unicel # C-3303 Filbur #N/A  

OD 3-1/8" Length 3-11/16" Top ID 1-13/16" Bottom ID 1-13/16"
8 sq. ft. Alcove

Replacement for Hot Tub Filter numbers Pleatco # PS9-4 Unicel # C-3608 Filbur # FC-3076

OD 3-1/4"
Length 9-3/4"
Top ID 1 1/16"
Bottom ID 1 1/16"
Replacement Hot Tub Filter
12 sq. ft. Sylvan  

Replacement for Hot Tub Filter numbers Pleatco # PS12 Unicel # C-3612 Filbur # FC-3069  

OD 3-1/4" Length 14-11/16" Top ID 1 1/16" Bottom ID 1 1/16"