Universal Spa Filter C-8465/PWK65/FC-3960/HS65

Compare the dimensions and connection of your current filter:
– Length: 338 mm (13.31 inch)
– Diameter: 152 mm (6 inch)
– Connection:
 • Top: closed with handle
 • Bottom: coarse external thread (MPT), 2 inch (± 59 mm outer diameter)

This filter fits if your old filter is marked with C-8465, PWK65, FC-3960, or HS65. Commonly used in larger spas, including models from HotSpring, Passion Spas, and similar brands.

Not sure? Feel free to send us a photo or the dimensions of your current filter – we are happy to assist you.

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 scale.

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, frays, 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's smart to keep a spare filter in stock and rotate regularly.