Spa & hot tub filter cross-reference
Read the end cap.
We'll find the cartridge.
Type the number molded into your old filter — a Sundance 6540-476, a Unicel C-8326, a Pleatco PTL47W — or a spa brand. You get the matching OEM, Unicel and Pleatco numbers plus diameter, length and fittings to check against a tape measure.
Browse by spa brand
Guides worth reading first
- How often should you replace a hot tub filter?
- How to clean a hot tub filter (step by step)
- How often should you clean a hot tub filter?
- How to find your spa filter size
- OEM vs Unicel vs Pleatco spa filters: what’s the difference?
- Signs your hot tub filter is bad (and needs replacing)
How we match a cartridge
01
Cross-referenced
Spa makers, Unicel and Pleatco number the same cartridge differently. We match them using the published tables.
02
Cited sources
Every row links the catalog page, and anything unconfirmed is clearly flagged so you can check it yourself.