Rainbow RDC50 Filter Cartridge

Length - 338mm. 

Diameter - 125mm. 

Hole - 54mm. 

Same size as the above model, however this one has thicker pleats. More filter area. 

By far the most common cartridge in use on the vast majority of spas dating back 15+ years

Practically every spa brand has or does use this cartridge. Also Chinese imported spas used this cartridge.

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