Filters for Thermospa tubs.

Filters to fit Thermospa tubs.

Here we have four popular sizes of filter that are used in this make of spa:

PWW 10 PR Outer Dia. 4 1/4" (108mm) x length 4" (102mm) with 2 1/8" (52mm) end holes.

PRB 25-IN Outer Dia. 5" (127mm) x length 13 5/16" (338mm) with 2 1/8" (52mm) end holes.

PRB 17.5SF(Pair) Outer Dia. 5" (127mm) x length 2 x 4 5/8" (118mm) with 2 1/8" (52mm) end holes.

PRB 25SF (each) Outer Dia. 5" (127mm) x length 2 x 6 5/8" (168mm) with 2 1/8" (52mm) end holes.