Pentair 20" Jumbo Twin Whole House Water Filter System

Build your whole-house filtration around your water supply with the Pentair 20" Jumbo Twin Whole House Water Filter System, available in three configurations for custom filtration, rainwater or mains water.

The system combines two Pentair 20" Jumbo filter housings on a stainless steel mounting bracket, supplied with a ball valve and housing spanner.

Choose Housing Only if you want to select your own cartridges, Rainwater for tank-water sediment and carbon filtration, or Mains Water for town-water sediment and KDF/GAC treatment.

The larger 20" Jumbo format provides a high-capacity platform for whole-house filtration applications.

Product Options

All three options use the same twin 20" Jumbo housing platform, allowing you to choose the filtration configuration that best matches your water source.

Housing Only

The Housing Only option provides the complete assembled twin-housing system without filter cartridges.

It includes:

• 2 × 20BWH 20" Jumbo Filter Housings
• Stainless steel mounting bracket
• Ball valve
• Housing spanner
• Assembled twin whole-house configuration

No filter cartridges are included.

This option is ideal when you already know which cartridges you want to use or need to create a filtration combination for a specific water-quality requirement.

Simply select compatible 20" Jumbo / Big Blue cartridges appropriate for your application.

Rainwater

The Rainwater option is configured for tank and rainwater supplies.

It combines progressive sediment filtration with radial flow granular activated carbon treatment.

Stage 1 — Pentair 20BDGD-PA Dual Gradient Density Sediment Filter

The first stage uses the Pentair 20BDGD-PA, a dual gradient density sediment cartridge.

It provides progressive filtration from:

25 Micron Outer Layer → 1 Micron Final Filtration

This allows larger sediment to be captured through the outer portion of the cartridge before finer particles are treated deeper within the filter.

Stage 2 — Pentair 20BRFGAC Radial Flow Granular Activated Carbon

The second stage uses the 20BRFGAC Radial Flow Granular Activated Carbon cartridge.

Its radial flow GAC design provides a carbon treatment stage following sediment filtration.

Rainwater Filtration Path

25-to-1 Micron Dual Gradient Sediment → Radial Flow Granular Activated Carbon

This provides a ready-made two-stage configuration for tank and rainwater supplies.

Mains Water

The Mains Water option is configured for town and mains water supplies.

It combines progressive sediment filtration with KDF/GAC treatment.

Stage 1 — Pentair 20BDGD-PA Dual Gradient Density Sediment Filter

The first stage uses the 20BDGD-PA Dual Gradient Density Sediment Cartridge.

Its progressive design provides:

25 Micron Outer Filtration → 1 Micron Final Filtration

The gradient construction allows larger particles to be captured first before progressively filtering finer sediment.

Stage 2 — Pentair 20BKDF-GAC

The second stage uses the Pentair 20BKDF-GAC cartridge.

This cartridge combines KDF media with high-performance granular activated coconut shell carbon.

The KDF media helps inhibit scale buildup within the filter, while the granular activated carbon provides treatment for chlorine, taste and odour.

It also incorporates a 5 micron spun-bonded polypropylene post sediment element for additional dirt-holding capacity.

Mains Water Filtration Path

25-to-1 Micron Dual Gradient Sediment → KDF + Granular Activated Carbon → 5 Micron Post-Filtration

This provides sediment and KDF/GAC treatment in a twin 20" Jumbo whole-house system.

Why Choose This Whole House Filter System?

• Twin-stage whole-house filtration — two 20" Jumbo housings provide two sequential treatment stages.
• Three configurations available — choose Housing Only, Rainwater or Mains Water.
• Pentair 20" Jumbo housings — built around two 20BWH filter housings.
• High-capacity 20" format — designed for whole-house filtration applications.
• Customisable Housing Only option — select cartridges according to your own water-treatment requirements.
• Dedicated Rainwater configuration — combines 25-to-1 micron sediment filtration with radial flow GAC.
• Dedicated Mains Water configuration — combines 25-to-1 micron sediment filtration with KDF/GAC treatment.
• Stainless steel mounting bracket — securely supports the twin housings.
• Ball valve included.
• Housing spanner included — assists with cartridge servicing.
• Assembled system — supplied as a twin whole-house filtration configuration.
• Replaceable cartridges — maintain the system without replacing the complete housing assembly.

How It Works

The system treats incoming water through two sequential 20" Jumbo filtration stages.

The exact filtration path depends on the option selected.

Housing Only

Stage 1 — Your Selected Cartridge → Stage 2 — Your Selected Cartridge

Choose compatible 20" Jumbo cartridges based on your water source and treatment requirements.

Rainwater

Stage 1 — 25-to-1 Micron Dual Gradient Sediment → Stage 2 — Radial Flow GAC

The sediment cartridge treats particulate matter before the water reaches the granular activated carbon stage.

Mains Water

Stage 1 — 25-to-1 Micron Dual Gradient Sediment → Stage 2 — KDF/GAC

The first cartridge provides progressive sediment filtration before the second cartridge provides KDF and activated carbon treatment.

Best Suited For

The Pentair 20" Jumbo Twin Whole House Water Filter System is well suited to:

• Whole-house water filtration
• Point-of-entry filtration
• Tank and rainwater filtration
• Town and mains water filtration
• Residential properties
• Rural properties
• Custom twin-stage filtration
• 20" Jumbo filtration systems
• High-capacity filtration applications
• Sediment filtration
• Carbon filtration
• KDF/GAC treatment
• Properties wanting replaceable cartridge filtration

Choose the configuration according to your water source and filtration requirements.

Key Specifications

Which Option Should I Choose?

Choose Housing Only If:

You want the assembled twin Pentair system but prefer to select your own 20" Jumbo cartridges.

This is the best option for custom filtration requirements or where you already have suitable replacement cartridges.

Important: No filter cartridges are included with this option.

Choose Rainwater If:

Your property uses a tank or rainwater supply.

You receive:

20BDGD-PA 25-to-1 Micron Dual Gradient Sediment + 20BRFGAC Radial Flow GAC

This provides progressive sediment filtration followed by granular activated carbon treatment.

Choose Mains Water If:

Your property uses a town or mains water supply.

You receive:

20BDGD-PA 25-to-1 Micron Dual Gradient Sediment + 20BKDF-GAC

This provides progressive sediment filtration followed by KDF/GAC treatment.

Rainwater Cartridge Combination

The Rainwater configuration contains:

1. Pentair 20BDGD-PA Dual Gradient Density Sediment Cartridge

Provides progressive:

25 Micron → 1 Micron

sediment filtration.

The gradient design captures larger particles through the outer section before progressively filtering finer particles deeper within the cartridge.

2. Pentair 20BRFGAC Radial Flow GAC Cartridge

Provides the second-stage granular activated carbon treatment.

Its radial flow design passes water through the GAC media following the initial sediment filtration stage.

Together:

Dual Gradient Sediment Filtration → Radial Flow Carbon Treatment

Mains Water Cartridge Combination

The Mains Water configuration contains:

1. Pentair 20BDGD-PA Dual Gradient Density Sediment Cartridge

Provides progressive 25-to-1 micron sediment filtration.

2. Pentair 20BKDF-GAC

Combines KDF media and high-performance granular activated coconut shell carbon.

The KDF media helps inhibit scale buildup within the filter, while the activated carbon provides chlorine, taste and odour treatment.

A 5 micron spun-bonded polypropylene post sediment element provides additional dirt-holding capacity.

Together:

Dual Gradient Sediment Filtration → KDF/GAC Treatment

Installation

The system is supplied as an assembled twin-housing whole-house filtration system.

Installation should position the filtration system on the incoming water line so water passes through both housings in the correct sequence.

The stainless steel bracket supports the two 20BWH housings.

For cartridge-equipped configurations:

Rainwater

Stage 1: 20BDGD-PA
Stage 2: 20BRFGAC

Mains Water

Stage 1: 20BDGD-PA
Stage 2: 20BKDF-GAC

After installation, slowly restore water pressure, check all connections for leaks and flush new cartridges appropriately before normal use.

Maintenance

The Pentair twin system uses replaceable 20" Jumbo filter cartridges, allowing the housings and mounting assembly to remain installed during routine servicing.

Cartridge replacement frequency will depend on:

• Incoming water quality
• Sediment loading
• Water consumption
• Cartridge type
• Treatment requirements

Replace cartridges when treatment performance declines, flow becomes excessively restricted or the applicable cartridge reaches its recommended service capacity.

The supplied housing spanner assists with opening the filter housings during cartridge servicing.

What's Included

Housing Only

• 2 × Pentair 20BWH 20" Jumbo filter housings
• Stainless steel bracket
• Ball valve
• Housing spanner
• Assembled twin filtration system
• No filter cartridges

Rainwater

• 2 × Pentair 20BWH 20" Jumbo filter housings
• Stainless steel bracket
• Ball valve
• Housing spanner
• 1 × 20BDGD-PA Dual Gradient 25-to-1 Micron Sediment Cartridge
• 1 × 20BRFGAC Radial Flow Granular Activated Carbon Cartridge

Mains Water

• 2 × Pentair 20BWH 20" Jumbo filter housings
• Stainless steel bracket
• Ball valve
• Housing spanner
• 1 × 20BDGD-PA Dual Gradient 25-to-1 Micron Sediment Cartridge
• 1 × 20BKDF-GAC KDF/GAC Cartridge

Frequently Asked Questions

What are the three options?

Choose from:

Housing Only — twin 20" Jumbo housing system without cartridges.

Rainwater — twin system with 20BDGD-PA and 20BRFGAC cartridges.

Mains Water — twin system with 20BDGD-PA and 20BKDF-GAC cartridges.

Are cartridges included with the Housing Only option?

No. The Housing Only configuration does not include filter cartridges.

It allows you to select compatible 20" Jumbo cartridges based on your own filtration requirements.

Which option should I choose for tank water?

Choose the Rainwater option.

It combines 25-to-1 micron dual gradient sediment filtration with radial flow granular activated carbon treatment.

Which option should I choose for town water?

Choose the Mains Water option.

It combines 25-to-1 micron dual gradient sediment filtration with KDF/GAC treatment.

What cartridges are included with the Rainwater option?

The Rainwater configuration includes:

20BDGD-PA — Dual Gradient 25-to-1 Micron Sediment

20BRFGAC — Radial Flow Granular Activated Carbon

What cartridges are included with the Mains Water option?

The Mains Water configuration includes:

20BDGD-PA — Dual Gradient 25-to-1 Micron Sediment

20BKDF-GAC — KDF/GAC

What does the 20BDGD-PA cartridge do?

The 20BDGD-PA provides progressive 25-to-1 micron sediment filtration, capturing larger sediment first before progressively treating finer particles.

What does the 20BRFGAC cartridge do?

The 20BRFGAC provides a radial flow granular activated carbon treatment stage following sediment filtration.

What does the 20BKDF-GAC cartridge do?

The 20BKDF-GAC combines KDF media with granular activated coconut shell carbon.

It provides chlorine, taste and odour treatment, while the KDF media helps inhibit scale buildup within the filter. It also incorporates a 5 micron spun-bonded polypropylene post-filter.

What size cartridges does the system use?

The system is designed around 20" Jumbo / Big Blue format cartridges compatible with the Pentair 20BWH housings.

Can I choose my own cartridges?

Yes. Select Housing Only if you want to build your own two-stage filtration combination.

Is the system assembled?

Yes. The system is supplied as an assembled whole-house filter system consisting of two 20BWH housings with a stainless steel bracket, ball valve and spanner.

Does it include a stainless steel bracket?

Yes. The twin housings are supplied with a stainless steel mounting bracket.

Is a housing spanner included?

Yes. A housing spanner is included to assist with servicing and cartridge replacement.

Can I change the cartridge combination later?

Yes. The housings use replaceable 20" Jumbo cartridges, allowing the filtration media to be changed as your requirements change.