You're currently on:

AK-3023 for Unicel C-4401

35 sq ft. Replacement Filter Cartridge for Universal Replacement: After Hours Spas, Replacement of Unicel C-4401, Pleatco PRB17.5SF-PAIR, PRB17.5 ZEL, PRB17.5 SF-PAIR

Replacement Filter Cartridge
35 sq ft.
4 15/16"
4 5/8"
4 15/16"
In Stock
Add Items to Cart


  • Top Cap:

    Open Hole: 2 1/8"

  • Bottom Cap:

    Open Hole: 2 1/8"


We ship most orders complete within 24hrs.

Product Highlights

This 35 sq. ft., 4 15/16" OD Pool or Spa Filter has a 2 1/8" Open Hole Top, a 2 1/8" w/ Molded Gasket Bottom, and is 4 5/8" long. It is crafted of the highest quality materials; and engineered to be superior. With USA MADE REEMAY®, the highest quality fabric that removes unwanted bacteria and contaminants, keeping your water crystal clean.
Our Pool and Spa Replacement Filter Cartridges meet or exceed OEM specifications. They install easily, and begin working to clean water immediately. Once you have tried our filters, you will see how they filter out more debris than the other brands, and out last other brands.

  • Guaranteed Perfect Fit
  • Filters Bacteria & Contaminants
  • Eco Friendly Filter Cartridge
  • Extremely Durable - Wash & Reuse
  • Withstands High Pressures & Temperatures
  • Energy Efficient
  • Easy Installation

Hint: keep an extra filter on hand so that when its time to clean your filter, you will be able to replace it immediately with the back-up. This will allow you the time to leisurely deep clean your dirty filter and allow it to dry completely before replacing it; and without any down time on your pool or spa system.

Unicel C-4401 - 35 sq ft. Replacement Filter Cartridge for Universal Replacement - Pleatco-PRB17.5SF-PAIR - Filbur-FC-2386 - OEM-R173432. Buy now at affordable cost just $22.40

Interchangeable Part Numbers

OEM:17-2606, 817-3510


Pleatco:PRB17.5SF-PAIR, PRB17.5 ZEL, PRB17.5 SF-PAIR


We have listed all known part numbers associated with this product. Some part numbers may not be listed for old/discontinued items. Every filter on this site is different. If you aren’t sure if this is your filter, call 661-833-9600. We’re happy to help.

Supported Brands

Universal Replacement: After Hours Spas, Apollo Spas, Aqua Tech Spas, Arizona Pacific, Beachcomber, Canspa Manufacturing, Caribbean Spas, Catalina Spas, Clearwater Spas, Diamond Back Spas, Discovery Spas, Dynasty Spas, Esther Williams, Freedom Spas, Grecian Spas, Hydro Spa, Jacuzzi Spa Division, Legend Spas, Lifestyle Spas, PDC Spas, Pentair Pool Products, Pentair Pool Products - Rainbow Plastics Replacements, Sundance Spas, Thermo Spas of Connecticut, Waterway Plastics

Some brands may not be listed. If you aren’t sure if this is your filter, call 661-833-9600. We’re happy to help.

Pleated Filter Cartridges from

Our Universal Pleated Filter Cartridges are washable, reusable, and durable. As a result, our filters last longer than other brands, and are more economical too. Our filters work hard for you by holding more dirt than other brands; and increased dirt holding capacity means cleaning your pool or spa less often.

Our universal pleated filter cartridges are constructed of the highest quality non-woven polyester, with a durable polypropylene core to provide maximum strength. The ends are immersed in thermo setting vinyl plastisol that seals the end of each pleat uniting the components and forming a permanent bonded end cap, unlike cheap alternatives. This makes our universal pleated filter cartridges perfect for residential, commercial, and industrial pool and spa applications.

Relish our comprehensive pool and spa collection that includes world-class filters and state-of-the-art pool, spa, and pond accessories at exclusive discount club prices. Please let us know if we don't have what you need, we CAN find it.

Wrong product, go to our Filter Finder to find your pool & spa filter cartridge. Or…We’re here to help. Call 661-833-9600 M-F 5:30 am to 4 pm PST. Is it after hours, email, and we’ll get back to you ASAP.

Customer Reviews

  1. Unicel C-4401- Easily Filter Spa Water ,5/2/15
    By James Smith

    The Unicel C-4401 pool products are perfect for Sundance Spas. It takes very less time to filter spa water.

Write a Review for Unicel: AK-3023

How do you rate this product?*
  1 star 2 stars 3 stars 4 stars 5 stars