DP Duo Filter Housing – 20” BIG – 1.5” In/Out

$710.60

Atlas Filtri DP Duo Filter Housing with Spanner & Bracket

A heavy-duty dual filter housing designed for high flow whole-house water filtration systems using large-capacity 20” BIG cartridges.

This commercial-grade DP Duo housing combines two 20” BIG filter housings onto a single moulded head, allowing multi-stage filtration in one compact assembly. It is designed for domestic, commercial, and industrial applications requiring high flow rates, larger cartridge capacity, and simplified installation.

What’s Included

• Dual 20” BIG filter housing assembly

• Integrated moulded Duo head

• Wall mounting bracket

• Housing spanner

• Pressure gauge ports

• Drain ports

• Lubrikit O-ring lubricant

How It Works (Simple Explanation)

This housing system is designed to hold two separate 20” x 4.5” BIG filter cartridges in series, allowing you to build a complete dual-stage whole-house filtration setup.

Each stage can be configured with different filtration media depending on your water treatment requirements.

Stage 1 – Sediment Filtration

The first housing is commonly used for coarse sediment removal.

This helps reduce:

• dirt,

• rust,

• sand,

• bark,

• and organic debris,

before the water reaches finer filtration stages. This helps protect downstream cartridges, plumbing, and appliances from premature wear and blockage.

Stage 2 – Carbon or Fine Filtration

The second stage is often configured with:

• fine sediment filters,

• carbon block cartridges,

• chlorine reduction media,

• or specialty filtration cartridges.

This stage helps improve:

• water clarity,

• taste,

• odour,

• and chemical reduction performance.

Features

Integrated Duo Moulded Head

The two housings are mounted onto a single moulded head, reducing:

• plumbing complexity,

• installation time,

• and potential leak points compared to separate standalone housings.

This makes installation cleaner and more compact while improving serviceability.

Pressure Gauge Ports

Integrated pressure gauge ports allow gauges to be installed directly into the housing assembly without additional plumbing.

Pressure monitoring makes it easier to determine when filters are becoming blocked, helping maximise cartridge life and maintain optimal system performance.

Drain Ports

Built-in drain ports simplify servicing and cartridge replacement.

By draining the housings before opening:

• water spillage is reduced,

• servicing becomes cleaner,

• and the filter bowls are lighter and easier to handle.

The included reversible spanner is designed to operate both the housing bowls and drain ports.

20” BIG Housing Design

The 20” BIG format provides:

• higher dirt-holding capacity,

• longer cartridge life,

• lower pressure loss,

• and improved flow capability compared to standard slimline housings.

This makes it particularly suitable for:

• larger homes,

• high water demand households,

• and commercial filtration systems.

Technical Specifications

• Housing type: DP Duo BIG

• Filter size: 20” BIG

• Cartridge compatibility: 20” x 4.5”

• Inlet/Outlet: 1.5” BSP

• Material: Reinforced polypropylene

• Max pressure: 8.3 bar (120 psi)

• Operating temperature: 4°C to 45°C

• Application: Whole supply filtration

Compatible Cartridge Types

Compatible with a wide range of 20” BIG cartridges including:

• sediment filters,

• pleated cartridges,

• carbon block filters,

• stainless steel screen filters,

• PFAS reduction cartridges,

• scale reduction cartridges,

• and specialty media filters.

Available Configurations

The Atlas Filtri BIG housing range is available in:

• MONO (single housing),

• DUO (double housing),

• and TRIO (triple housing) configurations.

Available filter sizes include:

• 10” BIG,

• and 20” BIG formats.

Compatible Accessories & Spare Parts

Common accessories include:

• pressure gauges,

• replacement spanners,

• wall brackets,

• and a wide range of sediment and carbon cartridges.

Compatible spare parts include:

• ATF-DPBIGSPANNER housing spanner,

• replacement wall brackets,

• and Lubrikit O-ring lubricant.

Best For

• Whole-house water filtration systems

• Dual-stage filtration setups

• High flow residential applications

• Commercial filtration systems

• Sediment and chlorine reduction systems

• PFAS and specialty filtration setups

• Homes wanting longer cartridge life and reduced maintenance intervals

The Bottom Line

The Atlas Filtri DP Duo 20” BIG housing is a versatile commercial-grade platform for building high flow whole-house filtration systems.

Its integrated dual-head design simplifies installation while supporting large-capacity cartridges and flexible filtration configurations. Whether you are building a sediment and chlorine reduction setup or a more advanced PFAS or scale management system, this housing provides a durable and adaptable foundation for whole-house water treatment.