1. Sediment Filters
  2. 20" x 4.5" BB Sediment Water Filters

20 x 4.5 Sediment Water Filters

Shop 20 x 4.5-inch sediment filter cartridges for 20-inch heavy-duty / Big Blue-style housings at All Filters. This page includes multiple sediment-media designs and micron ratings from Pentek, SpiroPure and other brands. Start by confirming that your housing uses a 20-inch large-diameter cartridge, then compare the exact model, media and micron rating required for your application. Use the individual product page to verify actual dimensions, housing compatibility, flow or pressure-drop data, replacement guidance and product-specific performance before ordering.

10-Inch vs 20-Inch Big Blue

Big Blue-style housings are commonly sold in both 10-inch and 20-inch lengths. A 20-inch cartridge is not interchangeable with a 10-inch cartridge simply because both are approximately 4.5 inches in diameter. If your housing uses the shorter format, shop the 10 x 4.5 sediment-filter page instead.

Sediment Filter Replacement Cross Reference Chart

Size

Rating

SpiroPure

Hydronix

Pentek

Other Brands
DGD Series

DGD Series

4.5" Dual-Gradient Density Melt-Blown Polypropylene

4.5" x 20"

  • 1 micron

  • 5 micron

  • 10 micron

  • 20 micron

  • 25 micron

  • 50 micron
AP Series

AP Series

Grooved Melt-Blown Polypropylene

4.5" x 20"

  • 5 micron

  • 25 micron
R Series

R Series

Pleated Polyester

4.5" x 20"

  • 1 micron

  • 5 micron

  • 10 micron

  • 20 micron

  • 30 micron

  • 50 micron
S1 Series

S1 Series

Non-Woven Pleated Polyester

4.5" x 20"

  • 20 micron
ECP Series

EC Series

Non-Woven Pleated Polyester

4.5" x 20"

  • 1 micron

  • 5 micron

  • 20 micron

  • 50 micron
WP Series

WP Series

4.5" BB String-Wound Polypropylene

4.5" x 20"

  • 0.5 micron

  • 1 micron

  • 5 micron

  • 10 micron

  • 20 micron

  • 25 micron

  • 30 micron

  • 50 micron

  • 100 micron

How to Choose a 20 x 4.5 Sediment Filter

  1. Confirm the housing length and cartridge diameter; do not select by "Big Blue" wording alone.
  2. Match an existing Pentek or other model number when one is available.
  3. Choose the correct media type for the application and water conditions.
  4. Match the required micron rating rather than assuming finer is always better.
  5. Verify exact product specifications and replacement guidance on the PDP.

Find the Ideal 20 x 4.5 Sediment Filter

Our cross-reference chart makes it easy to find 20 x 4.5 water filters that are compatible with your system. By comparing size, micron rating, and model numbers across brands, you can easily find a compatible OEM filter or SpiroPure alternative that fits your system. Here are some of the main features of each category:

  • DD Series: Ideal for uses like household appliances and fixtures, well water systems, pre-filtration for restaurants, and car washes.
  • AP Series: AP Series 4.5 x 20 sediment filters can hold large amounts of sediment, making them perfect for whole-house water systems and commercial uses like coffee machines and ice makers.
  • R Series: R Series 20 x 4.5 water filters are resistant to bacteria and chemicals, making them ideal for whole-house systems, commercial kitchens, restaurants, and industrial processes where consistent flow is needed.
  • S1 Series: Best for general sediment removal, S1 Series sediment filters are used in applications like coffee machines and under-sink or countertop systems.
  • ECP Series: Versatile filters that can be used for various applications like whole-house water systems, coffee machines, and ice makers.
  • WP Series: WP Series sediment filters are well-suited for heavy sediment removal, making them ideal for well water systems, irrigation systems, and whole-house water filtration. These filters protect plumbing and appliances from sediment.

Order 20 x 4.5 Water Filters Online

Upgrade your water filtration system with high-quality, affordable sediment filters from All Filters. Enjoy our large selection, friendly 7-day customer service, and free shipping on orders over $99, plus special shipping offers on certain products. Order 4.5 x 20 sediment filters online today and enjoy fast delivery.

Explore Other Sediment Filter Types

Pleated Water Filters | DD Series Sediment Filters | Melt-Blown Filter Cartridges | 50 x 2.5 Sediment Water Filters | 30 x 2.5 Sediment Water Filters | 40x2.5 Sediment Filters | 20 x 2.5 Sediment Water Filters | String-Wound Filter Cartridges | 2.5 x 5 Sediment Water Filters | 10x4.5 Sediment Water Filter | 10 x 2.5 Sediment Water Filter | Sediment Water Filter

FAQs on 20 x 4.5 Filters

Is a 20-inch Big Blue filter the same as a 20 x 4.5 filter?

The terms are often used for large-diameter 20-inch cartridges, but confirm the actual housing and cartridge specifications. Pentair Big Blue housings accept cartridges up to about 4.5 inches in diameter, and cross-brand fit should be verified for the exact housing.
Do not assume universal fit. Confirm housing length, cartridge diameter, end configuration where applicable, and the product's listed housing compatibility before ordering.
Use the rating required by your existing system or treatment objective. Finer ratings capture smaller particles but can affect loading and pressure drop differently depending on media, water quality and flow.
There is no single category-wide interval. Replacement depends on the exact cartridge, sediment loading, water quality, flow, pressure and usage. Follow the product and system guidance and replace when supported indicators show the cartridge is loaded.
Not necessarily. A larger cartridge may offer different flow or pressure-drop characteristics, but household pressure depends on the complete system, plumbing, media, micron rating and cartridge condition.
No. They may be compatible replacements in verified applications, but compatibility does not establish identical media, micron performance, flow, capacity, certification or service life.

Copyright © 2026 All Filters LLC. All rights reserved.