6 Pairs of PRB17.5 filters

Box of 6!
We also sell single filters.

Dimensions
Diameter: 125 mm (4 15/16")
Length: 117 mm (4⅝") - each filter
Top: 54 mm (2⅛") diameter hole
Bottom: 54 mm (2⅛") diameter hole

This filter pair is always used inside a narrow skimmer with a weir that opens outwards. Underneath a round basket is a sort of flying saucer, then the two filters stacked on top of one another.

This filter is available in Microban.
Microban inhibits the growth of bacteria on the surface of your hot tub filter. Microban filters stay clean longer and last longer than conventional spa filters.

Spa manufacturers who use this filter
Aquamarine, Aqua Tech, Beachcomber, Catalina Spas, Clearwater Spas, Discovery Spas, Dynasty, Esparanto, Freedom Spas, Hydro Spa, Legend Spas, Procopi, Somethy, Spaform, Spa France, Sundance Spas... and doubtless many others.

Part numbers
Pleatco : PRB17.5SF, PRB17.5SF-PAIR
Darlly : SC726 / 40352
Zenity : Z-4401
Unicel : C-4401
Filbur : FC-2386
Waterway : 817-3510
Sundance Spas : 6000-134