Hot Tub Filter Cartridge, 25 Sq Ft, 4-15/16 x 13-5/16 In., Replacement for Unicel C-4625, Pleatco PRB25-IN-4, Filbur FC-2370

Compatible with Unicel

C-4625

Hot Tub Filter Cartridge, 25 Sq Ft, 4-15/16 x 13-5/16 In., Replacement for Unicel C-4625, Pleatco PRB25-IN-4, Filbur FC-2370

Also sold as

17-2325FC-2370FC-2370-SCPRB25-IN-4ULTRA-S5

Your number not here? Send it to us and we'll confirm the match.

OEM numbers listed for fitment identification only.

Specifications

Compatible brandUnicel
CategoryHot Tub & Spa Filters
Lead time15–25 days after order confirmation
  • MOQ 50 pcs · samples from 1
  • Private label available
  • Ships from our factory

Request wholesale quote

or

One request covers the whole list — no need to send them one by one.

Tiered pricing available above 1,000 pcs · OEM packaging available

Product overview

C-4625 is an aftermarket pleated hot tub filter cartridge, 4-15/16 in. in diameter and 13-5/16 in. long, with 25 sq ft of filter area. Top: open (2-1/8" ID). Bottom: open (2-1/8" ID). Center opening: 2-1/8 in.

It interchanges with Pleatco PRB25-IN-4 and Filbur FC-2370.

Pleatco lists PRB25-IN-4 as discontinued in its 2025-26 catalog and names ULTRA-S5 as the successor. This cartridge keeps the original 4-15/16 x 13-5/16 in. size, so it drops into the same filter housing.

OEM cartridges it replaces: Pentair Pool Prod - Rainbow Plastics 17-2325.

Before ordering, measure the old cartridge — overall length, outside diameter and both end fittings. Some catalogs quote the length of threaded top-load cartridges with the thread and some without, so a quarter-inch difference between listings is common. We supply spa service companies, dealers and online retailers: MOQ 50 pcs per part, mixed cartons welcome, and single samples to confirm fit before a production order.

Fits these systems

Hot tubs and spas from Alps Spas, Aries Spas, Blue Pacific Spas, Esther Williams, Haughs, Heldor Spas, Hydro Pool Industries, J.E.M. Spas, Pentair Pool Prod - Rainbow Plastics, Sequoia Design, Warm Springs Spa.

Not sure it fits? Send us a photo of your part and we'll confirm. Send a photo

Sourcing questions

What OEM numbers does C-4625 replace?

POOLPOINT C-4625 is an aftermarket replacement cross-referenced to 17-2325, FC-2370, FC-2370-SC, PRB25-IN-4 and ULTRA-S5. Those numbers identify fitment only — the part is manufactured by POOLPOINT, not by Unicel.

Is C-4625 a genuine Unicel part?

No. POOLPOINT manufactures compatible aftermarket replacement parts. We are not affiliated with, sponsored by or endorsed by Unicel; the brand name and OEM numbers are used to identify fitment only.

What is the minimum order quantity for C-4625?

MOQ is 50 pcs per part, and mixed cartons are welcome to reach the order minimum. Samples are a separate case — we supply single pieces so you can confirm fitment before committing to a production run.

Factory directWe manufacture ourselves. No trading company in between.
Built to lastEngineering materials matched to OEM specs or better.
Cross-referencedEvery part mapped to the OEM numbers it replaces.
Bulk & container supplyMOQ from 50 pcs. Mixed cartons welcome.
3D fitment modelsVerify threads and ports before you commit.

C-4625

Hot Tub Filter Cartridge, 25 Sq Ft, 4-15/16 x 13-5/16 In., Replacement for Unicel C-4625, Pleatco PRB25-IN-4, Filbur FC-2370

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