Best Spa Filter 2026

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Last Updated - 27.03.2026

Best Choice

01

POOLPURE

POOLPURE Spa Filter, Whirlpool Filter Replacement for Unicel 6CH-940, Pleatco PWW50P3, PWW50-P3, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 378902, 03FIL1400 (Pack of 2)

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9.6

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Robust construction: the filters are constructed thanks to their robust construction and shatter-proof materials for maximum durability and function. The sturdy filter fabric with 45 m² surface, the ABS core and the sturdy lids allow a water flow with high pressure and are resistant to chlorine and other substances.
Premium pool and spare filter replacement: The Poolpure pool and spa filter replacement has been specially developed as a replacement filter for filter models from Pleatco Unicel Filbur and Waterway Plastics and comes as a value pack of 2 filters. Our filters are loss-free in water flow and thus offer the highest performance. Enjoy fresh, clean water in your pool and spa at any time that is free from harmful substances.
Powerful filtration: thanks to the innovative "dirt locking" technology, the filter is able to filter far more impurities from the water than conventional filters. Highly efficient hair, leaves, dust, sediment and sand are filtered out of the water. Nothing stands in the way of your bathing pleasure in clear, clean water with our filters.
Long service life thanks to innovative technology: thanks to the special structure of the trilobal filter fabric, not only the filtration is improved, but also cleaning is easier and the wear of the fabric is reduced. Thanks to the higher filter capacity, cleaning cycles are also extended. You have less effort and longer use for clear water in your spa and pool.
Compatibility and dimensions: our filters are compatible with Pleatco PWW50-P3, PWW50P3, Unicel 6CH-940, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 378902, 03FIL1400. The top is equipped with a semi-circular carry handle. Dimensions: total length (including handle and thread section): 24.75 cm, length (filter paper section): 20.5 cm, outer diameter: 15.2 cm, 1 1/2 inch (3.8 cm) SAE thread.

40,99 €
Value for Money

02

POOLPURE

POOLPURE Spa Filter, Whirlpool Filter Replacement for Unicel 6CH-940, Pleatco PWW50P3, PWW50-P3, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 378902, 03FIL1400 (Pack of 2)

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9.3

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Robust construction: the filters are constructed thanks to their robust construction and shatter-proof materials for maximum durability and function. The sturdy filter fabric with 45 m² surface, the ABS core and the sturdy lids allow a water flow with high pressure and are resistant to chlorine and other substances.
Premium pool and spare filter replacement: The Poolpure pool and spa filter replacement has been specially developed as a replacement filter for filter models from Pleatco Unicel Filbur and Waterway Plastics and comes as a value pack of 2 filters. Our filters are loss-free in water flow and thus offer the highest performance. Enjoy fresh, clean water in your pool and spa at any time that is free from harmful substances.
Powerful filtration: thanks to the innovative "dirt locking" technology, the filter is able to filter far more impurities from the water than conventional filters. Highly efficient hair, leaves, dust, sediment and sand are filtered out of the water. Nothing stands in the way of your bathing pleasure in clear, clean water with our filters.
Long service life thanks to innovative technology: thanks to the special structure of the trilobal filter fabric, not only the filtration is improved, but also cleaning is easier and the wear of the fabric is reduced. Thanks to the higher filter capacity, cleaning cycles are also extended. You have less effort and longer use for clear water in your spa and pool.
Compatibility and dimensions: our filters are compatible with Pleatco PWW50-P3, PWW50P3, Unicel 6CH-940, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 378902, 03FIL1400. The top is equipped with a semi-circular carry handle. Dimensions: total length (including handle and thread section): 24.75 cm, length (filter paper section): 20.5 cm, outer diameter: 15.2 cm, 1 1/2 inch (3.8 cm) SAE thread.

38,94 €
03

DingGreat

DingGreat Spa Filter Cartridge, Filter Cartridge, Whirlpool Filter Replacement for Unicel 6CH-940, Pleatco PWW50P3, PWW50-P3, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 03FIL1400, 378902, Pack of 2

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9.2

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

STRONG AND DURABLE The whole filter is made of shatterproof handle, high flow ABS inner core and thick filter fabric to form a strong and durable body. The filter can withstand high pressure and corrosion of high capacity chlorine.
POWERFUL FILTRATION PERFORMANCE Thanks to the innovative "dirt locking" technology, the fabric contains much more impurities than ordinary fabric. The filter can highly efficiently reduce hair, leaves, dust, sediment and sand. Enjoy your leisure time in your spa and hot tub.
LONG LIFE The unique structure of the trilobal filtration fabric makes it easy to capture and remove stains, so you can easily wash the filter after use. The filter has been tested to be used longer than the other brands with regular washing. Pay less money to have more fun.
Hole size 150 mm/5.9 inches; length 243 mm/9.5 inches; coarse thread 46.5 mm/1.8 inches.
COMPATIBILITY Replacement filter for pool compatible with Pleatco PWW50-P3, PWW50P3, Unicel 6CH-940, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 378902, 03FIL1400.

37,99 €
04

DingGreat

DingGreat Spa Filter Cartridge, Filter Cartridge, Whirlpool Filter Replacement for Unicel 6CH-940, Pleatco PWW50P3, PWW50-P3, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 03FIL1400, 378902, Pack of 2

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9.1

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

STRONG AND DURABLE The whole filter is made of shatterproof handle, high flow ABS inner core and thick filter fabric to form a strong and durable body. The filter can withstand high pressure and corrosion of high capacity chlorine.
POWERFUL FILTRATION PERFORMANCE Thanks to the innovative "dirt locking" technology, the fabric contains much more impurities than ordinary fabric. The filter can highly efficiently reduce hair, leaves, dust, sediment and sand. Enjoy your leisure time in your spa and hot tub.
LONG LIFE The unique structure of the trilobal filtration fabric makes it easy to capture and remove stains, so you can easily wash the filter after use. The filter has been tested to be used longer than the other brands with regular washing. Pay less money to have more fun.
Hole size 150 mm/5.9 inches; length 243 mm/9.5 inches; coarse thread 46.5 mm/1.8 inches.
COMPATIBILITY Replacement filter for pool compatible with Pleatco PWW50-P3, PWW50P3, Unicel 6CH-940, Filbur FC-0359, Waterway Plastics 817-0050, 25252, 378902, 03FIL1400.

37,99 €
05

AQUALTRA

AQUALTRA Spa Filter Cartridges for PRB25-IN, SPA Filter Replacement for C-4326, FC-2375, FC-2370, 3005845, 17-2327, 100586, 33521, 25392, 817-2500, 413-106, 338 x 127 MM 25 Sq. Ft Drop in Filter Pack of 2

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8.9

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

NSF certified materials and safety: the PRB25-IN spa filter consists of: a PET composite filter housing (robust and durable), a highly chlorine-resistant end cap, and a polypropylene core. All components are BPA free and comply with strict NSF/ANSI certification. So you can always enjoy your spa experience relaxed and safe
Multiple use with system: the AQUALTRA spa filter cartridges are made of specially impregnated polyester fabric (500+ wash cycles at 40°C) - designed for easy cleaning and extreme durability. Care recommendation: Rinse the cartridge with clean water every 1-2 weeks. Maximum filter performance through regular limescale removal. *Professional Tip*: Always remove the filter before cleaning agents – protects against corrosion and extends the service life by up to 70%!
High performance filtration with NSF certified materials: Our innovative spa filter combines a PET composite housing, chlorine-resistant end caps and a polypropylene core (all NSF/ANSI 50 certified and BPA-free) with patented dirt trapping technology - this retains up to 40% more particles than standard fabric. Aqualtra has been proven to eliminate hair/leaves dust/sediment sand/micro-particles (up to 120μm). Hygienically flawless water for maximum bathing comfort in your spa or pool - with proven longevity.
Customer satisfaction with service guarantee: As a certified pool filter specialist, we prioritize your shopping experience. If you have any questions about the AQUALTRA spa filter cartridge, please contact us. Commitment: Written solution sketch within 24 hours! *Purchase note*: Please check the compatibility of our PRB25-IN filter before ordering.
Compatible models: outer diameter: 5 inches / 127 mm; length: 13 5/16 inches / 338 mm; top and bottom: 2 1/8 inches / 54 mm opening. Filtration area: 25 sq. ft..AQUALTRA PRB25IN spa filter is compatible with C-4326, 413-106, FC-2375, 3005845, 17-2327, R172327, R173429, 5X13, 303909, M-4326, 42513, RD25. *Note*: All brand rights and manufacturer codes remain the property of their respective owners. These are only used for compatibility display. AQUALTRA is an independent branded product.

33,99 €
06

AQUALTRA

AQUALTRA Spa Filter Cartridges for PRB25-IN, SPA Filter Replacement for C-4326, FC-2375, FC-2370, 3005845, 17-2327, 100586, 33521, 25392, 817-2500, 413-106, 338 x 127 MM 25 Sq. Ft Drop in Filter Pack of 2

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8.7

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Show more
Main highlights

NSF certified materials and safety: the PRB25-IN spa filter consists of: a PET composite filter housing (robust and durable), a highly chlorine-resistant end cap, and a polypropylene core. All components are BPA free and comply with strict NSF/ANSI certification. So you can always enjoy your spa experience relaxed and safe
Multiple use with system: the AQUALTRA spa filter cartridges are made of specially impregnated polyester fabric (500+ wash cycles at 40°C) - designed for easy cleaning and extreme durability. Care recommendation: Rinse the cartridge with clean water every 1-2 weeks. Maximum filter performance through regular limescale removal. *Professional Tip*: Always remove the filter before cleaning agents – protects against corrosion and extends the service life by up to 70%!
High performance filtration with NSF certified materials: Our innovative spa filter combines a PET composite housing, chlorine-resistant end caps and a polypropylene core (all NSF/ANSI 50 certified and BPA-free) with patented dirt trapping technology - this retains up to 40% more particles than standard fabric. Aqualtra has been proven to eliminate hair/leaves dust/sediment sand/micro-particles (up to 120μm). Hygienically flawless water for maximum bathing comfort in your spa or pool - with proven longevity.
Customer satisfaction with service guarantee: As a certified pool filter specialist, we prioritize your shopping experience. If you have any questions about the AQUALTRA spa filter cartridge, please contact us. Commitment: Written solution sketch within 24 hours! *Purchase note*: Please check the compatibility of our PRB25-IN filter before ordering.
Compatible models: outer diameter: 5 inches / 127 mm; length: 13 5/16 inches / 338 mm; top and bottom: 2 1/8 inches / 54 mm opening. Filtration area: 25 sq. ft..AQUALTRA PRB25IN spa filter is compatible with C-4326, 413-106, FC-2375, 3005845, 17-2327, R172327, R173429, 5X13, 303909, M-4326, 42513, RD25. *Note*: All brand rights and manufacturer codes remain the property of their respective owners. These are only used for compatibility display. AQUALTRA is an independent branded product.

33,99 €
07

YANHUA

YANHUA Spa Filter for Whirlpool Filter, PWW50 Filter Cartridge Replacement for PWW50P3 Spa Filter, for Unicel 6CH-940, for Filbur FC-0359, for Waterway Plastics 817-0050 (2 Pieces)

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8.6

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Product compatibility: Replacement for PWW50-P3, PWW50P3, for Unicel 6CH-940, for Filbur FC 0359, for Waterway Plastics 817-0050, 25252, 378902, 03FIL1400
POWERFUL FILTRATION PERFORMANCE Thanks to the innovative "dirt locking" technology, the fabric contains much more impurities than ordinary fabric. The foldable design of the filter cartridge for PWW50 increases the filter area, the for PWW50 filter can highly efficiently reduce hair, leaves, dust, sediment and sand.
LONG LIFE The unique structure of the trilobal filtration fabric makes it easy to capture and remove stains, low pressure difference, large flow, long service life, allowing you to easily wash the filter after use and reduce costs.
Filter for PWW50: 100% polyester fiber material, better dust collection capacity, the durable polyester makes the cartridge last longer than other choice. The entire for PWW50 filter consists of a shatterproof handle, a high flow ABS inner core and a thick filter fabric to form a strong and durable body.
Filter cartridge for PWW50 filter: hole size 150 mm/5.9 inches; length 241 mm/9.5 inches; coarse thread 46.5 mm/1.8 inches. Measure your PWW50 filter and match it with the dimensions of this filter before ordering.

37,99 €
08

YANHUA

YANHUA Spa Filter for Whirlpool Filter, PWW50 Filter Cartridge Replacement for PWW50P3 Spa Filter, for Unicel 6CH-940, for Filbur FC-0359, for Waterway Plastics 817-0050 (2 Pieces)

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10% Off
8.5

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Product compatibility: Replacement for PWW50-P3, PWW50P3, for Unicel 6CH-940, for Filbur FC 0359, for Waterway Plastics 817-0050, 25252, 378902, 03FIL1400
POWERFUL FILTRATION PERFORMANCE Thanks to the innovative "dirt locking" technology, the fabric contains much more impurities than ordinary fabric. The foldable design of the filter cartridge for PWW50 increases the filter area, the for PWW50 filter can highly efficiently reduce hair, leaves, dust, sediment and sand.
LONG LIFE The unique structure of the trilobal filtration fabric makes it easy to capture and remove stains, low pressure difference, large flow, long service life, allowing you to easily wash the filter after use and reduce costs.
Filter for PWW50: 100% polyester fiber material, better dust collection capacity, the durable polyester makes the cartridge last longer than other choice. The entire for PWW50 filter consists of a shatterproof handle, a high flow ABS inner core and a thick filter fabric to form a strong and durable body.
Filter cartridge for PWW50 filter: hole size 150 mm/5.9 inches; length 241 mm/9.5 inches; coarse thread 46.5 mm/1.8 inches. Measure your PWW50 filter and match it with the dimensions of this filter before ordering.

36,09 € 39,99 €(10% Off off)
09

TOREAD

TOREAD Replacement for Spa Filter Unicel 6CH-940, PWW50P3 (Not PWW50P4), Filbur FC-0359, 817-0050, 25252, 03FIL1400, 1 1/2" SAE Thread Screw in Filter, Pack of 2

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8.3

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

【6-MONTH RETURN POLICY GUARANTEED!】Product Life Time Warranty on Every Filter Confirmed with Defects in Material, Workmanship, and Any Filter Caused Malfunction within Each Filter's 12-Month Service Life. We promise a risk-free shopping experience backed up with our reliable customer service and technical support team which is located to Los Angeles.
Reinforce structure: with 25% thicker filtration fabric, heavy chlorine resistant and break-resistant end caps and reinforced centre support, the filter delivers high powered propulsion flow, and crystal clear water, providing you with a relaxed and healthy enjoyment.
Recovery models: TRF-6CH-940 compatible with PWW50P3 (not PWW50P4), Unicel 6CH-940, Aladdin 14510, Baleen AK-9019, 78902, SD-00031, SD-00710, PLE-051-919. 3, PLE-0 51-9194 Length: 7 5/8"; Outside Diameter: 6"; Top: Circular Handle; Bottom: 1 1/2" SAE thread (Coarse Thread); Filtration Area: 45 sq. ft. NOTE: This is a compatible spare part and the manufacturers' names and part numbers have been used for reference purposes only. TOREAD is an independent brand.
NSF/ANSI 50 certified: TOREAD pool and spa filter is tested and certified by IAPMO against NSF/ANSI 50. The filter with certified safe materials provides you with clean, fresh and clear water. Only select certified filters for your family to ensure the safety, health and happiness of your loved ones.
More efficient filtration area: Uniformity and high-performance trilobal fabric has 21-40% higher capacity compared with common point-bond fabric. The trilobal shape of fabric fibers also helps catch particles, increases efficiency without the pressure drop penalty, and helps reduce filter cleanining frequency.

37,99 €
10

TOREAD

TOREAD Replacement for Spa Filter Unicel 6CH-940, PWW50P3 (Not PWW50P4), Filbur FC-0359, 817-0050, 25252, 03FIL1400, 1 1/2" SAE Thread Screw in Filter, Pack of 2

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8.1

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Show more
Main highlights

【6-MONTH RETURN POLICY GUARANTEED!】Product Life Time Warranty on Every Filter Confirmed with Defects in Material, Workmanship, and Any Filter Caused Malfunction within Each Filter's 12-Month Service Life. We promise a risk-free shopping experience backed up with our reliable customer service and technical support team which is located to Los Angeles.
Reinforce structure: with 25% thicker filtration fabric, heavy chlorine resistant and break-resistant end caps and reinforced centre support, the filter delivers high powered propulsion flow, and crystal clear water, providing you with a relaxed and healthy enjoyment.
Recovery models: TRF-6CH-940 compatible with PWW50P3 (not PWW50P4), Unicel 6CH-940, Aladdin 14510, Baleen AK-9019, 78902, SD-00031, SD-00710, PLE-051-919. 3, PLE-0 51-9194 Length: 7 5/8"; Outside Diameter: 6"; Top: Circular Handle; Bottom: 1 1/2" SAE thread (Coarse Thread); Filtration Area: 45 sq. ft. NOTE: This is a compatible spare part and the manufacturers' names and part numbers have been used for reference purposes only. TOREAD is an independent brand.
NSF/ANSI 50 certified: TOREAD pool and spa filter is tested and certified by IAPMO against NSF/ANSI 50. The filter with certified safe materials provides you with clean, fresh and clear water. Only select certified filters for your family to ensure the safety, health and happiness of your loved ones.
More efficient filtration area: Uniformity and high-performance trilobal fabric has 21-40% higher capacity compared with common point-bond fabric. The trilobal shape of fabric fibers also helps catch particles, increases efficiency without the pressure drop penalty, and helps reduce filter cleanining frequency.

36,09 €