Universal Spa Filter C-4326/PRB25-IN/FC-2375

Compare the dimensions and connection of your current filter:
– Length: 335 mm (13.2 inches)
– Diameter: 125 mm (5 inches)
– Connection:
 • Top: closed
 • Bottom: fine internal thread (SAE), 1.5 inches (± 38 mm internal diameter)

If your old filter matches one of the numbers C-4326, PRB25-IN, or FC-2375, then this is almost certainly the right replacement. Widely used in compact and medium-sized spas, including models from Passion Spas, Dimension One, and other well-known brands.

Not sure? Send us a photo or the dimensions of your current filter – we are happy to help further

On average, you replace a spa filter every 2 to 3 months for optimal water quality and proper functioning of your spa. Even with regular cleaning, a filter eventually becomes saturated with dirt, oils, and lime.

How do you know it's time to replace your filter?

Watch for the following signs:
• The filter remains dirty despite thorough cleaning
• The material is damaged (cracks, fraying, or deformation)
• The water remains cloudy or smells unpleasant
• The water flow decreases
• Your pump makes more noise or works harder than normal

If you use your spa frequently or with multiple people, it may be necessary to replace the filter more often than every 3 months. For those who want certainty, it is wise to keep a spare filter in stock and switch regularly.