Caldera Oasis Replacement Filter
6-person hot tub · 2002-2009 · 1 filter cartridge
OEM Caldera 73533. San Gabriel 2008-2009 also uses this filter.
Compatible Filter Cartridges
| Pleatco | PRB50-IN |
| Unicel | C-4950 |
| Filbur | FC-2390 |
| OEM | Jacuzzi 373045 |
| OEM | Jacuzzi 373045J |
Frequently Asked Questions
What filter cartridge does the Caldera Oasis use?
The Caldera Oasis (2002-2009) runs the PRB50-IN (also sold as C-4950, 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 Caldera Oasis need?
One cartridge. That said, some Caldera 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 Caldera Oasis?
Most Caldera owners get 12 to 24 months out of a cartridge, depending on how heavily the spa is used. A larger tub like this holds more water, so the cartridge works a little harder and tends to want cleaning more often. 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.