The Caldera 73532 filter cartridge is a factory-original replacement for select Caldera Paradise® Series spas. With 50 square feet of filtration across 260 pleats of heavy-duty polyester, it delivers more efficient filtration and better water clarity — so you spend less time cleaning and more time enjoying your hot tub.
Your filter does the work you never see. Every soak leaves behind body oils, lotions, hair, and fine debris, and the cartridge is what removes all of it before it clouds the water, feeds bacteria, or coats your plumbing. When a filter is worn or clogged, the effects show up everywhere else: dull water, higher chemical use, softer jets, and a pump and heater straining against restricted flow.
What stands out on this cartridge is how much filtering surface Caldera packs into a compact size — 260 pleats across a 50 square foot cartridge that’s just under 11 inches tall. Caldera specifies a heavy-duty polyester media built to outlast cheaper alternatives, and a semi-circular handle on top makes lifting it out for cleaning effortless. Like all Caldera filters, it’s made in the USA.
Pro Tip: Caldera uses several cartridge sizes — match the part number, not just the shape. The 50, 75, and 100 square foot Caldera filters look similar at a glance but differ in height and fitment, and the right one depends on your exact model and year. Pull your current cartridge and read the part number printed on it before you order, and check how many your spa takes.
Brand
Caldera®
