Single replacement Cal Spas filter (35 sq ft drop-in style) — Hurricane — Made in the USA
Fits select Cal Spas models with the 35 sq ft drop-in filter (open both ends, 9-1/4″ long). Match the diameter, length, and top and bottom style below to the filter you are replacing — if the numbers match, it fits.
Hurricane filters are made in the USA by a team of industry veterans with decades of experience at America’s leading filter manufacturers. Premium filtration media on a true high-flow core — not a drilled PVC core — means better water flow, better filtration, and easier cleaning.
In stock — orders processed same day or next business day. These filters should last 6 months when used with a filter cleaner.
Not sure which filter brand is right for you? Compare hot tub filter brands here.
Did you know the number one reason for hot tub freeze damage is a dirty filter? Dirty filters also cause additional stress on the pump/motor and leads to premature failure.
Proper Filter Care System:
- Have 2 sets of filters
- Install clean filter
- Rinse dirty filter with high pressure nozzle
- Verify no debris left between pleats, before storing on shelf to dry
- Once a month soak filters in a filter cleaner solution
Filter Specs (EZ03):
- Diameter – 5″
- Length – 9-1/4″
- Top: Open, 2-1/8″ hole
- Bottom: Open, 2-1/8″ hole
- SQFT: 35
What’s in the box: one Hurricane filter cartridge.
✅ Not Sure It Fits? Verify Before Ordering
Hot tub part compatibility can vary by spa brand, model, year, serial number, control system, and part revision.
To help us identify the correct replacement part, please send clear photos of:
- Your existing part label or sticker
- Your spa serial number sticker
- The equipment area or installation location (if accessible)
EZ Hot Tub Parts can help confirm fitment before you order and help reduce costly returns.
It fits select Cal Spas models with the 35 sq ft drop-in filter (open both ends, 9-1/4″ long). Measure your old filter end to end and across the end cap — this cartridge is 5″ across and 9-1/4″ long with a open, 2-1/8″ hole top and open, 2-1/8″ hole bottom. If the numbers match, it fits. Not sure? Send a photo through the form above.
This cartridge cross-references to: Hurricane HF4335-01, Pleatco PRB35-IN, Unicel C-4335, Filbur FC-2385, Waterway 817-3501, Guardian 409-219, ProAqua PA-1435, Darlly 40353.
Yes — we stock this Hurricane filter in Minnesota and ship orders the same or next business day. Orders over $99 ship free in the lower 48.
Hurricane cartridges are made in the USA on a true high-flow core with premium pleated media — the same construction as the name-brand originals at a lower price. It is our stocked value pick.
Rinse it every 2–4 weeks, deep-clean it monthly with filter cleaner, and replace it every 12–24 months or sooner if the pleats are torn, flattened, or the end caps are cracked. Keeping a second set to rotate makes both sets last longer.
A second set means you always have a clean, dry filter ready to drop in while the other set soaks. Multi-packs also cost less per filter than buying singles.
HF4335-01 Hurricane HF4335-01 Pleatco PRB35-IN Unicel C-4335 Filbur FC-2385 Waterway 817-3501 Guardian 409-219 ProAqua PA-1435 Darlly 40353
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