Filter Type 12 (4CH-21 / PDM25 / SC716 / 40191 / CH19)

Starting at £18.95

In stock

Replacement for 4CH-21, PDM25, SC716, Darlly 40191 or Magnum CH19 to Vita Spa hot tubs with a fine thread fitting.

Grouped product items
Conventional Filter Type 12 (4CH-21 / PDM25 / SC716 / 40191 / CH19)
Conventional Filter Type 12 (4CH-21 / PDM25 / SC716 / 40191 / CH19)
More Information
Filter Diameter Measurement (cm) 11.7cm (4 5/8")
Filter Length Measurement (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
Filbur Reference FC-0121
Unicel Reference 4CH-21
Pleatco Reference PDM25
Magnum Reference CH19
Darlly Reference 40191
Additional Reference SC716
Equivalent OEM Reference Saratoga: 20245-238

We know this filter fits the following makes of hot tub.

It is hard to keep up with all the manufacturers changes so it could also fit makes not shown here.

Aegean D M Industries Dream Maker Spas Saratoga Spas Vita Spa Voyager Spa

Conventional Filter Type 12 (4CH-21 / PDM25 / SC716 / 40191 / CH19)

A clean and fully functional hot tub filter is essential to maintain clean, clear healthy water. 

Surespa hot tub filters are manufactured in New Zealand using Reemay Advantage™ filter media which employs 100% polyester synthetic fibres to provide optimum filtration efficiency.

The high temperatures and a wet environment of a hot tub makes filter surfaces an ideal environment for the growth of bacteria. It is important to clean grease, scale and bacteria from your filters regularly using Surespa Powder Filter Cleaner and to replace hot tub filters approximately yearly.


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.

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