Hot Spot Relay Replacement Filter
5-person hot tub · 2008-present · 1 filter cartridge
OEM Watkins 31489.
Compatible Filter Cartridges
| Pleatco | PWK30 |
| Unicel | C-6430 |
| Filbur | FC-3915 |
| OEM | Watkins 31489 |
| OEM | Hot Spring 31489 |
Frequently Asked Questions
What filter cartridge does the Hot Spot Relay use?
The Hot Spot Relay (2008-present) runs the PWK30 (also sold as C-6430, the same physical cartridge with a different sticker). Confirm by reading the label inside the filter compartment or the part number printed on the end cap of your existing cartridge before you order.
How many filters does the Hot Spot Relay need?
One cartridge. That said, some Hot Spot models in the same series use two, so it's worth opening the filter compartment and confirming what's actually installed before you order.
How often should I replace the filter on my Hot Spot Relay?
Most Hot Spot owners get 12 to 24 months out of a cartridge, depending on how heavily the spa is used. Rinse it monthly with a hose, hitting the pleats at about a 45-degree angle. Soak it overnight in filter cleaner every three to four months. Replace it when the pleats are torn, the seams are stained brown and won't come clean, or a soak no longer drops the post-rinse pressure.