---
product_id: 11549116
title: "155281-43 BBF1-20MB Water Deionization Filter Cartridge, 20\" x 4-1/2\""
brand: "pentek"
price: "$438.68"
currency: USD
in_stock: true
reviews_count: 11
category: "Pentek"
url: https://www.desertcart.us/products/11549116-155281-43-bbf1-20mb-water-deionization-filter-cartridge-20-x
store_origin: US
region: United States of America
---

# 16 megohm ultra-pure water resistivity Fits all 20" Big Blue housings 1,850 grain high-capacity resin 155281-43 BBF1-20MB Water Deionization Filter Cartridge, 20" x 4-1/2"

**Brand:** pentek
**Price:** $438.68
**Availability:** ✅ In Stock

## Summary

> 💧 Elevate your water purity game—because your projects deserve nothing less!

## Quick Answers

- **What is this?** 155281-43 BBF1-20MB Water Deionization Filter Cartridge, 20" x 4-1/2" by pentek
- **How much does it cost?** $438.68 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/11549116-155281-43-bbf1-20mb-water-deionization-filter-cartridge-20-x)

## Best For

- pentek enthusiasts

## Why This Product

- Trusted pentek brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Robust & Reliable Build:** Durable polypropylene shell with Buna-N gaskets guarantees a secure, leak-free seal under varied operating conditions.
- • **Long-Lasting High Capacity:** 1,850 grain resin capacity ensures extended filter life and fewer replacements—saving you time and money.
- • **Low TOC & TDS for Precision:** Minimizes total organic carbon and dissolved solids, perfect for sensitive pharmaceutical, medical, and electronics applications.
- • **Ultra-Pure Water, Every Time:** Delivers semiconductor-grade deionization up to 16 megohms for flawless lab and industrial use.
- • **Universal Big Blue Compatibility:** Seamlessly fits all standard 20" x 4.5" Big Blue housings for easy upgrades and maintenance.

## Overview

The Pentair Pentek BBF1-20MB is a 20" x 4.5" high-capacity deionization filter cartridge featuring semiconductor-grade mixed bed resin with a 1,850 grain capacity. It produces ultra-pure water with resistivity up to 16 megohms, fitting all standard 20" Big Blue housings. Designed for industrial, pharmaceutical, medical, and electronics applications, it ensures low TOC and TDS levels with durable polypropylene construction and Buna-N gaskets for reliable, long-lasting performance.

## Description

The Pentair Pentek BBF1-20MB is a high-capacity Big Blue deionization cartridge engineered for facilities that demand ultra-pure water. Built with semiconductor-grade mixed bed DI resin, this 20" x 4.5" cartridge reduces dissolved ions to produce water up to 16 megohm resistivity, meeting the stringent purity requirements of pharmaceutical labs, medical facilities, cosmetics production, and electronics manufacturing.With a 1,850 grain capacity, the BBF1-20MB delivers significantly longer service life than standard 2.5" diameter DI cartridges, making it a cost-effective solution for high-demand environments. The low TOC resin minimizes organic contamination, while the polypropylene shell, endcaps, and integrated pre/post-filters provide durable, chemically compatible construction. Buna-N gaskets ensure a secure seal in any standard 20" Big Blue housing.Designed for a suggested flow rate of 1.25 gpm with a minimal 1.1 psi pressure drop, this cartridge maintains consistent output quality across operating temperatures of 40-100 degrees F (4.4-37.8 degrees C). Suitable for boiler makeup, cooling towers, humidification systems, laser equipment, and steam applications.

Review: Excellent filters. Should last long - Wanted to upgrade the 10 inch filters to this and I was able to by getting the 20 inch housings and swapping some parts. I go through a lot of DI water at work and needed larger filters. We run our water through a water softener first. Then it goes through a set of GE Merlin RO filters which brings the TDS down to 11 ppm. Then the water goes through 2 of these 20 inch DI filters and then in to a storage tank. Using 3 calibrated TDS meters, we get 0 ppm. The resistivity through some machines is so high, we have to add a hint of tap water back. So it truly is DI water.
Review: Used it for spot free rinse on my cars. - This has worked great as a post free rinse on my cars i purchased solids parts per million counter and my water is around 180 , Once I'm done washing my car i hook up the filter and put the nozzle on a very low flow and rinse the car off "basically spot free rinse" Car comes out spotless This will hold me over until I'm able to purchase the larger spotless system.

## Features

- HIGH-CAPACITY, SEMI-CONDUCTOR-GRADE RESIN CARTRIDGES are ideal for use in a variety of industrial settings, including pharmaceutical and medical laboratories, cosmetics, and circuit board printing applications
- FITS ALL 20" Big Blue Housing and can replace any 20" x 4.5" filter cartridge
- CONVENIENT AND COST-EFFECTIVE for applications where low levels of total organic carbon (TOC) and total dissolved solids (TDS) are required
- DESIGNED FOR DEIONIZING WATER up to 16 megohms
- CAPACITY OF 1,850 grains

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004H3547U |
| Best Sellers Rank | #114,651 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1,081 in Filters & Filter Media |
| Brand | Pentek |
| Brand Name | Pentek |
| Customer Reviews | 4.4 out of 5 stars 52 Reviews |
| External Testing Certification | FDA |
| Global Trade Identification Number | 00051678281031 |
| Item Dimensions D x W x H | 5"D x 5"W x 21.18"H |
| Item Type Name | Big Blue Deionization Water Filter, 20-Inch, Mixed Bed Deionization Filter Cartridge, 20" x 4.5" |
| Item Weight | 8.28 Pounds |
| Manufacturer | Pentair Industries |
| Manufacturer Part Number | 155281-44 |
| Material | Polypropylene (PP) |
| Material Type | Polypropylene (PP) |
| Model Number | BBF-20MB |
| Number of Items | 1 |
| Product Benefits | Removes Odor |
| Product Dimensions | 5"D x 5"W x 21.18"H |
| UPC | 051678281031 |
| Unit Count | 1.0 Count |

## Product Details

- **Material:** Polypropylene (PP)
- **Product Dimensions:** 5"D x 5"W x 21.18"H
- **Item Weight:** 8.28 Pounds
- **External Testing Certification:** FDA
- **Product Benefits:** Removes Odor

## Images

![155281-43 BBF1-20MB Water Deionization Filter Cartridge, 20" x 4-1/2" - Image 1](https://m.media-amazon.com/images/I/51ZmL07wT+S.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent filters. Should last long
*by G***I on January 13, 2024*

Wanted to upgrade the 10 inch filters to this and I was able to by getting the 20 inch housings and swapping some parts. I go through a lot of DI water at work and needed larger filters. We run our water through a water softener first. Then it goes through a set of GE Merlin RO filters which brings the TDS down to 11 ppm. Then the water goes through 2 of these 20 inch DI filters and then in to a storage tank. Using 3 calibrated TDS meters, we get 0 ppm. The resistivity through some machines is so high, we have to add a hint of tap water back. So it truly is DI water.

### ⭐⭐⭐⭐⭐ Used it for spot free rinse on my cars.
*by J***R on April 29, 2013*

This has worked great as a post free rinse on my cars i purchased solids parts per million counter and my water is around 180 , Once I'm done washing my car i hook up the filter and put the nozzle on a very low flow and rinse the car off "basically spot free rinse" Car comes out spotless This will hold me over until I'm able to purchase the larger spotless system.

### ⭐⭐⭐⭐⭐ I got exactly what I ordered.
*by S***. on February 17, 2021*

Arrived in perfect condition, I use these filters on CNC Laser cooling chillers.

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-03*