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You are here: Home > Hot Tub Filters by Size > 2" Diameter Hot Tub Filters
Choose a Sub-Category
Filter Range: 2" OD x 5-8" Length Filter Range: 2" OD x 8-10" Length Filter Range: 2" OD x 14-16" Length
Filter Range: 2" OD x 16-18" Length Filter Range: 2" OD x 18-20" Length Filter Range: 2" OD x 28-30" 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
4 sq. ft. Spa In A Box, Spa2Go  

Replacement for Hot Tub Filter numbers Pleatco # PSB3.5 Unicel # C-2305 Filbur # FC-3120  

OD 2-3/4" Length 5 1/8" Top ID 1 1/16" Bottom ID 1 1/16"
4 sq. ft. Skim Filter Icon Spas, Aqua Care  

Replacement for Hot Tub Filter numbers Pleatco # PH3.7-B Unicel # C-2304 Filbur # FC-3027  

OD 2-3/4"
Length 6" Top ID
Closed Bottom ID 1 1/16"
6 sq. ft. Harmsco ST/6, "Red Top"  

Replacement for Hot Tub Filter numbers Pleatco # PH6-4 Unicel # T-380R Filbur # FC-3061  

OD 2-3/4"
Length 9-3/4"
Top ID 1-1/16"
Bottom ID 1-1/16"
Replacement Hot Tub Filter Replacement Hot Tub Filter Replacement Hot Tub Filter
6 sq. ft. Harmsco OTC/6-4 Betterfilter  

Replacement for Hot Tub Filter numbers Pleatco # N/A Unicel # C-2306 Filbur # FC-3062  

OD 2-3/4"
Length 9-3/4"
Top ID 1 1/16"
Bottom ID 1 1/16"
6 sq. ft. Pentair MX Series, Premier Springwater  

Replacement for Hot Tub Filter numbers Pleatco # N/A Unicel # C-2606 Filbur # FC-3066  

OD 2-7/8"
Length 9-3/4"
Top ID 1 1/16"
Bottom ID 1 1/16"
6 sq. ft. Wet Institute    

Replacement for Hot Tub Filter numbers Pleatco # N/A Unicel # C-2601 Filbur # FC-2301  

OD 2-5/8" Length 14-11/16" Top ID 1-1/16" Bottom ID 1-1/16"
Replacement Hot Tub Filter Replacement Hot Tub Filter Pleatco PSB3.5
8 sq. ft. Pentair, Rainbow, American Products  

Replacement for Hot Tub Filter numbers Pleatco # N/A Unicel # C-2308 Filbur # FC-2308  

OD 2-7/8"
Length 9-3/4"
Top ID 1 1/16"
Bottom ID 1 1/16"
6 sq. ft. Wet Institute M-66, M-330, M-166  

Replacement for Hot Tub Filter numbers Pleatco # N/A Unicel # C-2607 Filbur # FC-3065  

OD 2-7/8" Length 2-7/8" Top ID 1 1/16" Bottom ID 1 1/16"
Pleatco Spa in a Box PSB3.5 4 sqft Hot Tub Filter

Replaces Unicel C-2305, Filbur FC-3120

OD - 2 3/4"
Length 5 1/8
Replacement Hot Tub Filter Replacement Hot Tub Filter Replacement Hot Tub Filter
6 sq. ft. Pentair  

Replacement for Hot Tub Filter numbers Pleatco # PH6 Unicel # C-2604 Filbur # FC-2310  

OD 2 7/8"
Length 9-3/4"
Top ID 1 1/16"
Bottom ID 1 1/16"
8 sq. ft. Pentair Pool Products, Rainbow 19  

Replacement for Hot Tub Filter numbers Pleatco # N/A Unicel # C-2608 Filbur # FC-2330  

OD 2-7/8"
Length 19-1/2"
Top ID 1 1/16"
Bottom ID 1 1/16"
12 sq. ft. Pentair, Rainbow  

Replacement for Hot Tub Filter numbers Pleatco # PW15WC Unicel # C-2912 Filbur # FC-2365  

OD 2-7/8"
Length 14-11/16"
Top ID 1 1/16"
Bottom ID 1 1/16"
Replacement Hot Tub Filter Replacement Hot Tub Filter Replacement Hot Tub Filter
12 sq. ft. Pentair, Rainbox 19X  

Replacement for Hot Tub Filter numbers Pleatco # PRB12-4 Unicel # C-2612 Filbur # FC-2340  

OD 2-7/8"
Length 19-1/2"
Top ID 1 1/16"
Bottom ID 1 1/16"
10 sq. ft. Encon Spa

Replacement for Hot Tub Filter numbers Pleatco # N/A Unicel # C-2610 Filbur # FC-3067  
OD 2-5/8"
Length 19-15/16"
Top ID 1 1/16"
Bottom ID 1 1/16"
15 sq. ft. Pentair, Rainbow Hi Flow, Emerald, Cygnus, Conway  

Replacement for Hot Tub Filter numbers Pleatco # PRB14.5 Unicel # C-2302 Filbur # FC-2320  

OD 2-7/8"
Length 17 1/16"
Top ID 1 1/16"  
Bottom ID 1 1/16"
Replacement Hot Tub Filter Replacement Hot Tub Filter Replacement Hot Tub Filter
9 sq. ft. Pentair, Rainbow Chlor, Emerald, Cygnus, Conway  

Replacement for Hot Tub Filter numbers Pleatco # PRB8.5 Unicel # C-2303 Filbur # FC-2324  

OD 2-7/8"
Length 17 1/16"
Top ID 2 1/8"  
Bottom ID 2 1/8"
Disposable Pre-Filter

Replacement for Hot Tub Filter numbers

Pleatco # N/A Unicel # N/A Filbur # FC-3128

OD 2-3/4"
Length 10"
Top ID Hose Fitting
Bottom ID Closed
12 sq. ft. Pentair, Rainbox 29  

Replacement for Hot Tub Filter numbers Pleatco # PRB12L-4 Unicel # C-2613 Filbur # FC-2350  

OD 2-7/8"
Length 29-1/4"
Top ID 1 1/16"
Bottom ID 1 1/16"
Replacement Hot Tub Filter
18 sq. ft. Pentair, Rainbow 29X  

Replacement for Hot Tub Filter numbers Pleatco # PRB18-4 Unicel # C-2618 Filbur # FC-2360  

OD 2-7/8"
Length 29-1/4"
Top ID 1 1/16"
Bottom ID 1 1/16"