Filter Type 12 (4CH21 / FC0121)

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Filter Specification

Additional Information

Filter Diameter (cm) 11.7cm (4 5/8")
Filter Length (cm) 20.3cm (8")
Filter Top Finish Handle
Filter Bottom Fitting Fine 3.8cm (1 1/2") MPT Thread
Filtration Area (sq ft) 19 sq ft
Number of Pleats 158
Filbur Reference FC-0121
Unicel Reference 4CH-21
Pleatco Reference N/A
Darlley Reference 40191
Equivalent OEM Reference Saratoga: 20245-238

Product Description

removable hot tub filter bezelNote : If replacing an old Pleatco brand threaded filter cartridge, be aware that these have a removable male pipe thread fitting which slip-fits into a hole in the bottom of the filter. You may need to unscrew the pipe fitting from your spa's filter housing if it did not come out with the old filter (many spa owners are not even aware that the fitting is still in there) before you can screw in your new filter.


The filters that we sell are moulded as a single piece, so that the threaded fitting always comes out of the spa with the filter.

Availability: In stock

Product Price Quantity
Conventional Filter Type 12 (4CH21 / FC0121)
£26.90

Club Price: £24.21

  • Buy 2 for £25.51 each
  • Buy 6 for £23.60 each
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4ch-21 hot tub filters

  • 4ch-21 hot tub filters
  • spa filters with fine thread

This filter is known to fit the following hot tubs...

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