C-4326 Unicel PRB25-IN Pleatco Comparable Tier1 Replacement Pool and Spa Filter

Price $19.95
Availability: In Stock
Fits the Dynamic Series I RDC-25, I RDC-25S, Dynamic Series II & II RTL/RCF-25, Dynamic Series IV-DFM, DFML and Waterway 25
  • Reduces sediment for up to 3 months
  • Prolong the life and performance of the filter by rinsing it between changes
  • Fits in place of Filbur FC-2375, Pleatco PRB25-IN, and Unicel C-4326 filters.
  • Top and Bottom hole size: 2 1/8 inches
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The Tier1 PAS-1438 replacement pool and spa filter is designed to quickly and efficiently clean your water without putting extra wear and tear on your pool or spa filtration system. The 3 ounce media filter fits the Dynamic Series I RDC-25, I RDC-25S, Dynamic Series II & II RTL/RCF-25, Dynamic Series IV-DFM, DFML and Waterway 25. It features high durability filter pleated fabric media that will maintain its strength even when loaded with filtered sediment. The Tier1 PAS-1438 media has a tighter porosity, a denser weave to capture more contaminants in less time, while the highly durable core supports the filter while maintaining its high flow rate.

Experience the Tier1 Difference

Tier1 manufactures high-quality filtration and household products. We take creating and maintaining a healthy home seriously. Products must undergo rigorous testing and meet demanding quality expectations in order to earn the Tier1 badge. Every purchase is backed by the Tier1® Guarantee:

  • Guaranteed Fit
  • Guaranteed Quality
  • Guaranteed Price

Summer is Here!

The Tier1 Pool and Spa Filters provide quality filtration that will keep your pool clean all summer long! This filter protects your pool equipment from sand and sediment that could be cause damage. This filter is easy to install and maintenance is a breeze. Reduce the stress of keeping your pool clean by using the Tier1 Pool and Spa Filter! Enjoy your Summer!

Package Qty 1
Replaces Filbur FC-2375
Replaces Pleatco PRB25-IN
Replaces Unicel C-4326
Pool/Spa Manufacturer Tier1
Manufacturer's Id PAS-1438
UPC 700355942429
Bottom Hole Size 2 1/8 inches
Media Weight (oz) 4
Media Square Feet 25
Actual Size (in) 13 5/16 inches (length) x 5 inches (outside diameter)
Actual Size (cm) 33.81 x 12.7
Primary Filter Media Pleated Fabric
Filter Life (months) 3 months
Warranty Guarantee 30 day 100% satisfaction guarantee
Primary Filter Media Pleated Fabric

Reduced Contaminants

The TIER1-PAS-1438 reduces the following contaminants:

  • Sand
  • Sediment

The TIER1-PAS-1438 is comparable with the following part numbers

702 25392 33521 100586
303909 17-2325 17-2327 C-4326
C-4625 FC-2370 FC-2375 M-4326
PAS-1438 PAS-1439 PAS-1440 PRB25-IN
PRB25-IN-4 PRB25-IN-M SD-00196

The TIER1-PAS-1438 fits the following model numbers

RDC-25 RDC-25S
RTL-25 RCF-25
Waterway 25


  1. It is time to clean or replace your filter cartridge when the pressure gauge on your filter tank reaches 8 psi above the pressure recorded when a new cartridge has been installed.
  2. It is also time to clean or replace your filter cartridge if there is a noticeable decrease in the pressure coming from your return jets.
  3. Turn the power off to your pump and bleed the excess air pressure of the system using the air valve on the filter.
  4. Remove any band clamps and/or lids to your filter.
  5. Remove the cartridge from the filter canister and dislodge any loose debris by directing a stream of water from a garden hose between each pleat.
  6. Do not use a high pressure car wash wand or a stiff brush to clean your cartridge. These abrasive methods may damage the filter media and snap the bands.
  7. Apply a spray on filter cleaner to the cartridge or grid to remove any oils or other organics. If stubborn stains persist, soak the cartridge overnight in a solution of TSP (trisodium phosphate).
  8. Rinse the cartridge thoroughly with clean fresh water and return it to the filter tank. Secure the tank lid and any band clamps.
  9. Restart your filtration system per manufacturer’s instructions.

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