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You are here: Home > Hot Tub Filters by Size > 8" Diameter Hot Tub Filters
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Filter Range: 8" OD x 6-8" Length Filter Range: 8" OD x 8-10" Length Filter Range: 8" OD x 10-14" Length
Filter Range: 8" OD x 14-16" Length Filter Range: 8" OD x 16-18" Length Filter Range: 8" OD x 18-20" Length
Filter Range: 8" OD x 22-24" Length Filter Range: 8" OD x 24-26" Length Filter Range: 8" OD x 28-30" Length
Filter Range: 8" OD x 30-32" Length Filter Range: 8" OD x 32-34" Length Filter Range: 8" OD x 34-36" Length
Filter Range: 8" OD x 38-40" 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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Maax Spas 100593 Hot Tub Filter Master Spas Twilight Outer Filter X268512 Pleatco PBF35M
Maax Spas 100593 Hot Tub Filter
Price: $53.73
Sale Price: $39.95
Save $13.78!

(1)
Master Spas X268512 Twilight Outer Filter
Price: $47.50
Sale Price: $21.25
Save $26.25!

(7)
Pleatco PBF35-M 35 sqft Hot Tub Filter
Price: $42.58
Sale Price: $40.50
Save $2.08!

(2)
50 sq ft - fits Coleman Spas, California Cooperage and Maax Collection

Alternative Part Numbers:
3201-2261, Pleatco PCS50N, Unicel C-8450, Filbur FC-3310, RJ Filtration AK-7006

Filter Dimensions:
OD - 8"
Length - 9"
Top end cap inside 2 1/16"
Bottom End Cap - Slip ID: 2"
Master Spas Twilight Series Outer Filter with Microban by Master Spas.

This filter is used with the Twilight Series Eco Pur Inner Filter X268511.

Works on Master Spas Twilight Series spas "ONLY", 2009-Current.

Filter made with Microban Antibacterial Protection by Pleatco.

Pleatco Number PMA25-M

Height: 8 1/4"
Diameter: 6 1/2"
Opening: 4 1/16"
Bullfrog 35, 2003-2012 Pleatco: PBF35-M

Unicel: 8CH-950 Filbur: FC-0536

Diameter: 8"
Length: 5 7/8"
Top: Handle Bottom: 2" modified ACME
Filter Area: 35 sq ft

Antimicrobial
Pleatco PBF50F2S Pleatco PCS75N Pleatco PCS75N-M
Hot Tub Filter, 50 sq ft - fits Bullfrog Spas

Unicel 8CH-950 | Filbur FC-0536

OD - 8"
Length - 5 7/8"
Top - Handle
Bottom - 2" Coarse Thread
Filter Area - 50 sq ft
75 sq. ft. Coleman Spas 75, California Cooperage  
Replacement for Hot Tub Filter numbers Pleatco # PCS75N-M Unicel # C-8475 Filbur # FC-3320  
OD 8"
Length 13"
Top ID 2-1/8"
Bottom ID 2" /Male Slip Fit
75 sq. ft. Coleman Spas 75, California Cooperage  

Replacement for Hot Tub Filter numbers Pleatco # PCS75N Unicel # C-8475 Filbur # FC-3320

Antimicrobial

OD 8"
Length 13"
Top ID 2-1/8"
Bottom ID 2" /Male Slip Fit
Pleatco PWK65 Pleatco PWK65M Replacement Hot Tub Filter
65 sq. ft. Hot Springs Spas, Caldera Spas  
Replacement for Hot Tub Filter numbers Pleatco # PWK65 Unicel # C-8465 Filbur # FC-3960  
OD 8-1/2"
Length 10-1/2"
Top ID 3"
Bottom ID 3"
65 sq. ft. Hot Springs Spas, Caldera Spas  

Replacement for Hot Tub Filter numbers Pleatco # PWK65 Unicel # C-8465 Filbur # FC-3960  

OD 8-1/2"
Length 10-1/2"
Top ID 3"
Bottom ID 3"
100 sq. ft. Rec Warehouse, Jacuzzi Leisure  

Replacement for Hot Tub Filter numbers Pleatco # N/A Unicel # C-8310 Filbur # FC-3570  

OD 8-1/2" Length 15-3/16" Top ID 2-3/16" Bottom ID 3-1/8"
Replacement Hot Tub Filter Replacement Hot Tub Filter Replacement Hot Tub Filter
150 sq. ft. Rec Warehouse, Jacuzzi Leisure  

Replacement for Hot Tub Filter numbers Pleatco # PRW150 Unicel # C-8315 Filbur # FC-3575  

OD 8-1/2" Length 22-11/16" Top ID 2-3/16" Bottom ID 3-1/8"
75 sq. ft. Pentair Purex DM-75  

Replacement for Hot Tub Filter numbers Pleatco # PDM75 Unicel # C-8401 Filbur # FC-1970  

OD 8-7/8"
Length 19-1/2"
Top ID 4"
Bottom ID 4"
90 sq. ft. Pentair Purex DM-90  

Replacement for Hot Tub Filter numbers Pleatco # PDM90 Unicel # C-8402 Filbur # FC-1971  

OD 8-7/8"
Length 19-1/2"
Top ID 4"
Bottom ID 4"
Replacement Hot Tub Filter Replacement Hot Tub Filter Replacement Hot Tub Filter
120 sq. ft. Pentair Purex DM-120  

Replacement for Hot Tub Filter numbers Pleatco # PDM120 Unicel # C-8403 Filbur # FC-1972  

OD 8-7/8"
Length 19-1/2"
Top ID 4"
Bottom ID 4"
75 sq. ft. Hayward Series C751, Sta-rite PXC-75, Waterway  

Replacement for Hot Tub Filter numbers Pleatco # PA76-4 Unicel # C-8411 Filbur # FC-1255  

OD 8-15/16" Length 17-3/8" Top ID 4" Bottom ID 4"
125 sq. ft. Sta-Rite PXC-125, Waterway  

Replacement for Hot Tub Filter numbers Pleatco # PWWPC125B Unicel # C-8413 Filbur # FC-2575  

OD 8-15/16"
Length 28-3/16"
Top ID 4"
Bottom ID 4"
Replacement Hot Tub Filter Replacement Hot Tub Filter Replacement Hot Tub Filter
Replacement Hot Tub Filter
Price: $54.00
Sale Price: $49.50
Save $4.50!
150 sq. ft. Astral 2515 CE Terra, Speck Pumps AC2515  

Replacement for Hot Tub Filter numbers Pleatco # PAST150 Unicel # C-8415 Filbur # FC-0903  

OD 8-15/16"
Length 24-7/16"
Top ID 3-3/4"
Bottom ID 3-3/4"
50 sq. ft. Astral 2505 CE Terra  

Replacement for Hot Tub Filter numbers Pleatco # PAST50 Unicel # C-8449 Filbur # FC-0900  

OD 8-15/16"
Length 10-1/4"
Top ID 3-3/4"
Bottom ID 3-3/4"
120 sq. ft. Sundance Spas, Crystal Water Spas  

Replacement for Hot Tub Filter numbers Pleatco # PSD125 Unicel # C-8320 Filbur # FC-2750  

OD 8-7/16"
Length 18-1/8"
Top ID Castle
Bottom ID 2-1/2"
Replacement Hot Tub Filter Replacement Hot Tub Filter Replacement Hot Tub Filter
75 sq. ft. Astral 2507 CE Terra, Speck Pumps AC 2507  

Replacement for Hot Tub Filter numbers Pleatco # PAST75 Unicel # C-8474 Filbur # FC-0901  

OD 8-15/16"
Length 15"
Top ID 3-3/4"
Bottom ID 3-3/4"
180 sq. ft. Pentair Purex DM-180  

Replacement for Hot Tub Filter numbers Pleatco # N/A Unicel # C-8405 Filbur # FC-1973  

OD 8-7/8"
Length 39"
Top ID 4"
Bottom ID 4"
240 sq. ft. Pentair Purex DM-240  

Replacement for Hot Tub Filter numbers Pleatco # N/A Unicel # C-8406 Filbur # FC-1974  

OD 8-7/8"
Length 39"
Top ID 4"
Bottom ID 4"