4 Pack of replacement Clearwater Spas filters (35 sq ft drop-in style) — ProAqua High Flow
Fits select Clearwater Spas models that use the 35 sq ft drop-in style cartridge. Clearwater Spas used more than one filter size over the years, so match the diameter, length, and top and bottom style below to the filter you are replacing — or send us a photo and we will confirm before you order.
This same cartridge is also used in select Apollo Spas, Discovery Spas, Dynasty Spas, Hydro Spas, PDC Spas, Sundance Spas, Sunrise Spas, Thermo Spas hot tubs.
ProAqua high-flow filters were formerly sold under the Proline name — same filter, same high-flow core, new name.
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:
- Diameter – 4-15/16″
- Length – 4-5/8″
- Top: Open
- Bottom: Open
- SQFT: 35
What’s in the box: four filter cartridges.
✅ 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 the Clearwater Spas models that use a 35 sq ft drop-in style cartridge measuring 4-15/16″ in diameter and 4-5/8″ long. Measure your old filter end to end and across the end cap — if the numbers match, it fits. Still unsure? Use the fitment form above and send a photo of your filter.
Measure the diameter across the end cap and the total length from end to end, then check the top (open, closed, handle) and the bottom (open, threaded, slip fit). This cartridge is 4-15/16″ x 4-5/8″, top: open, bottom: open.
This cartridge cross-references to: SD6000-134, Pleatco PRB17.5SF-PAIR, Filbur FC-2386, Unicel C-4401, 17-175-1610, 11802C4401, R172606, 817-3510, 11802, NFC2386, FC-2386B, PRB17.5-SF, PRB17.5SF-JH-MPAIR, PRB17.5SF-JH-PAIR, R172606B, R173432, XLS-404, 10008.
Yes. ProAqua is the new name for the Proline high-flow line — same filter, same high-flow core.
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 two sets and rotating them makes each set 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.
PA-1517 SD6000-134 Pleatco PRB17.5SF-PAIR Filbur FC-2386 Unicel C-4401 17-175-1610 11802C4401 R172606 817-3510 11802 NFC2386 FC-2386B PRB17.5-SF PRB17.5SF-JH-MPAIR PRB17.5SF-JH-PAIR R172606B R173432 XLS-404 10008
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