MWF 20" x 4.5" Twin Big Blue Whole House Untreated Rainwater Filtration System with Disruptor® BIO

Advanced Two-Stage Whole House Water Filtration - Designed to Help Protect Your Family from Contaminants in Untreated Rainwater.

The MWF 20" x 4.5" Twin Big Blue Whole House Rainwater Filtration System with Disruptor® BIO is a complete two-stage water filtration system designed for Australian homes and properties relying on untreated rainwater tanks.

Rainwater may look fresh and clean, but water collected from rooftops and stored in tanks can contain sediment, bacteria, viruses, organic matter and other contaminants introduced by birds, animals, insects and the surrounding environment.

Unlike treated city water, rainwater is generally not disinfected before entering your home.

That's why this advanced whole-house system combines two specialised filtration cartridges inside a durable Twin Big Blue filter housing assembly.

Stage 1 - 1 Micron Pleated Sediment Cartridge: Captures dirt, rust, sand, silt and suspended particles, helping protect the second-stage cartridge from premature blockage.

Stage 2 - Disruptor® BIO Untreated Rainwater Cartridge: Uses patented electroadsorption technology, advanced nanofibre filtration and additional BIO filtration media to target microscopic contaminants, including bacteria, viruses, selected PFAS compounds and heavy metals.

Together, these two filtration stages provide advanced contaminant reduction for your home's rainwater supply, helping deliver cleaner, clearer and better-quality filtered water throughout your home.

The system is designed to be installed on the main incoming rainwater supply, allowing water to be filtered before reaching your household taps, showers, kitchen, laundry and appliances.

With SGS laboratory testing demonstrating exceptional contaminant reduction performance for Disruptor® filtration technology, this complete system combines advanced filtration, practical maintenance and high-capacity whole-house operation.

No electricity is required to operate the filtration cartridges. Additional disinfection may still be appropriate depending on the microbiological quality of your rainwater and your household's requirements.

The BIG Problem with Our Rainwater Supplies Today

Rainwater is one of nature's wonderful resources, but collecting and storing rainwater does not automatically mean it is free from contaminants.

Rainwater tanks can receive unwanted material from:

• Birds and Animals: Droppings and other contamination deposited on rooftops and gutters.

• Dust and Airborne Particles: Dirt, dust and fine particles washed into tanks during rainfall.

• Leaves and Organic Matter: Decaying vegetation and organic debris entering the collection system.

• Bacteria and Other Microorganisms: Microbiological contaminants introduced through roof catchments, tank openings and the surrounding environment.

• Roofing and Plumbing Materials: Certain materials may introduce metals or other contaminants into stored water.

• Agricultural and Environmental Sources: Some properties may experience contamination from surrounding land use and airborne pollutants.

Just because rainwater looks clean does not mean it is free from microscopic contaminants.

A properly selected and maintained filtration system can help reduce contaminants before the water is distributed throughout your home.

What Makes This Product Unique

• Complete Two-Stage Whole House Filtration System: Includes two Big Blue filter housings and two specialised cartridges designed to work together.

• Designed for Untreated Rainwater: Developed for homes relying on rooftop-collected and tank-stored rainwater.

• Advanced Disruptor® BIO Technology: Uses patented electroadsorption, nanofibre filtration and additional BIO media to target microscopic contaminants.

• Sediment Protection Before BIO Filtration: The pleated sediment cartridge captures suspended particles before water enters the Disruptor® BIO cartridge.

• High-Capacity Filtration: The 20" x 4.5" cartridge format is designed for compatible whole-house water filtration applications.

• No Electricity Required for Filtration: Both filtration cartridges operate through water flow without requiring an electrical connection.

• Durable Big Blue Filter Housings: Designed for whole-house filtration with robust construction and metal-reinforced connection ports.

• Pressure Gauge Connection Points: The system provides connection points for compatible pressure gauges, allowing water pressure to be monitored when gauges are fitted.

• Choice of Mounting and Protection Options: Select from available bracket configurations and an optional stainless steel frame and protective cover.

• 5-Year Housing Warranty: The filter housings are supported by a five-year warranty, subject to the applicable warranty terms.

• Independent Laboratory Testing: Disruptor® filtration technology is supported by SGS contaminant reduction testing.

How the Two-Stage Filtration System Works

Stage 1: 1 Micron Pleated Sediment Cartridge

The First Line of Defence - Capturing Sediment and Helping Protect Your Disruptor® BIO Cartridge.

The 1 Micron Pleated Sediment Cartridge is installed in the first Big Blue filter housing, where it captures fine sediment and suspended particles before water reaches the second filtration stage.

Rainwater tanks can accumulate dirt, dust, sand, rust, silt and organic debris over time.

The pleated design provides a large filtration surface area, helping collect sediment while supporting water flow through the system.

What the Sediment Cartridge Helps Remove:

• Algae and Organic Debris: Helps capture suspended algae and larger organic particles.

• Dirt and Dust: Reduces particles entering the water supply from roofs and gutters.

• Rust: Captures suspended rust particles from tanks, pipes and fittings.

• Sand and Silt: Reduces fine sediment that can accumulate in stored rainwater.

• Suspended Particles: Helps improve water clarity and reduces sediment loading on the second cartridge.

Why Choose Pleated Sediment Filtration?

• 1 Micron Filtration: Designed to capture fine suspended particles according to the cartridge's micron rating.

• Large Filtration Surface Area: The pleated design provides more surface area for collecting sediment.

• Helps Prevent Premature Blockage: Captures sediment before it reaches the Disruptor® BIO cartridge.

• Washable Design: The pleated cartridge may be gently rinsed to remove accumulated sediment, where permitted by the manufacturer.

• Supports Ongoing Water Flow: Regular cleaning or replacement helps maintain water flow through the system.

Important: Sediment filtration alone is not sufficient to make untreated rainwater safe for drinking.

Stage 2: Disruptor® BIO Untreated Rainwater 20" x 4.5" Cartridge

Advanced Microbiological and Chemical Contaminant Reduction - The Heart of Your Whole House Filtration System.

The Disruptor® BIO 20" x 4.5" Cartridge is the second filtration stage and provides the system's specialised contaminant reduction performance.

Using patented Disruptor® electroadsorption filtration technology, this advanced cartridge combines depth filtration, nanofibre filtration and additional BIO filtration media to target microscopic contaminants that conventional sediment filtration alone cannot adequately address.

The cartridge is designed to reduce a broad range of contaminants, including bacteria, viruses, fine particles, selected PFAS compounds and heavy metals.

The additional BIO filtration media surrounds the original Disruptor® technology, providing an expanded filtration structure designed to enhance contaminant capture.

The original Disruptor® filtration technology has been used successfully by My Water Filter customers for many years.

The newer BIO configuration builds on this established technology with additional filtration media designed specifically for untreated rainwater applications.

With the sediment cartridge protecting the second stage, the Disruptor® BIO cartridge can focus on its advanced contaminant reduction role with less exposure to sediment loading.

Disruptor® Laboratory Test Results

Disruptor® filtration technology has undergone independent SGS laboratory testing, demonstrating exceptional contaminant reduction performance under specified test conditions.

The following laboratory reduction results have been reported for Disruptor® filtration technology:

• E. coli / Total Coliforms: Greater than 99.9999% reported microbiological reduction.

• Coliphage (Bacterial Virus Surrogate): 99.9995% reduction.

• Lead (Pb): Greater than 99.4% reduction at pH 6.5.

• Copper (Cu): Greater than 99.9% reduction.

• PFOS (Perfluorooctane Sulfonic Acid): Greater than 99.0% reduction.

• PFOA (Perfluorooctanoic Acid): Greater than 97.6% reduction.

• Total Chlorine (Including Chloramines): Greater than 95.7% reported reduction.

• Free Chlorine: Greater than 99.5% reduction.

Testing & Certification

Independently Laboratory Tested

Disruptor® filtration technology has been evaluated using recognised water filtration and microbiological testing methods.

• NSF/ANSI 42: Testing associated with aesthetic water quality effects, including specified chlorine, taste and odour reduction.

• GB/T 5750.12-2023: Microbiological testing methods for drinking water.

• US EPA Method 1602: Testing method for male-specific and somatic coliphages in water.

Designed in Australia using German and Swedish components.

Filtration Benefits Throughout Your Home

Enjoy the Benefits of Filtered Rainwater from Your Kitchen to Your Bathroom, Laundry and Beyond.

By filtering rainwater at the main incoming supply, this system helps reduce contaminants before water is distributed throughout your home.

The Benefits Include:

• Kitchen and Drinking Water: Helps reduce tested microbiological and chemical contaminants in the rainwater supply.

• Showers and Bathrooms: Reduces suspended sediment and particles entering household bathroom fixtures.

• Laundry: Helps reduce dirt, rust and sediment that may otherwise enter washing machines and laundry taps.

• Household Appliances: Sediment filtration helps reduce particulate matter entering connected appliances.

• Improved Water Clarity: Captures suspended particles that can affect the appearance of stored rainwater.

• Whole House Convenience: Filters water at the main supply rather than requiring separate sediment and BIO cartridges at individual taps.

One Complete System - Two Specialised Filtration Stages - Filtered Rainwater Throughout Your Home.

What's Included with Your System

The MWF 20" x 4.5" Twin Big Blue Whole House Rainwater Filtration System includes:

• 1 x 20" x 4.5" Big Blue Whole House Twin Water Filter

• 1 x 1 Micron Pleated Sediment Cartridge

• 1 x Disruptor® BIO Untreated Rainwater Cartridge

• 1 x housing removal tool

• Pressure Gauge Connection Points for compatible gauges, where provided on the selected housing configuration

Optional Upgrades: Stainless steel mounting bracket, stainless steel protective frame and cover, and pressure gauges, according to the available product options.

Please Note: Plumbing installation, additional pipework, fittings and accessories not specified in the selected package are not included.

Optional Stainless Steel Protective Cover

Protect Your Whole House Water Filtration System with a Durable Stainless Steel Cover.

For homes where the filtration system is installed outdoors, an optional stainless steel protective frame and cover provides additional protection against environmental exposure.

Designed for Australian conditions, this upgrade combines durability, practical protection and a clean, professional appearance.

Features:

• Corrosion-Resistant Stainless Steel: Designed to withstand outdoor exposure.

• Protection from Direct Sunlight: Helps shield the filter housings from UV exposure.

• Additional Physical Protection: Helps protect the system from accidental contact and environmental exposure.

• Neat, Professional Appearance: Provides a tidy finish to the installation.

• Accessible Maintenance: Designed to allow access for cartridge servicing.

Benefits:

• Helps protect the filtration system from weather exposure.

• Reduces direct sunlight reaching the filter housings.

• Provides a durable, attractive installation.

• Helps protect your investment over time.

A practical upgrade for customers wanting additional protection for an outdoor whole-house filtration installation.

Installation

Professional Installation for Reliable Whole House Water Filtration.

The MWF Twin Big Blue Whole House Rainwater Filtration System is designed to be installed on the main incoming rainwater supply before water is distributed throughout the home.

This allows both filtration stages to treat the incoming water supply before it reaches household taps, showers and appliances.

Installation Considerations:

• Correct Positioning: Install the filtration system in an appropriate position on the incoming rainwater supply.

• Correct Filtration Sequence: Water must pass through the sediment cartridge first, followed by the Disruptor® BIO cartridge.

• Suitable Water Pressure and Flow: Ensure the system is compatible with the property's water pressure, pump and household flow requirements.

• Pressure Protection: Install appropriate pressure control equipment where required to keep the system within its rated operating limits.

• Accessible Location: Allow sufficient room beneath the housings for cartridge replacement and ongoing maintenance.

• Protection from Weather: Install in accordance with the housing manufacturer's requirements for sunlight, weather and temperature exposure.

• Licensed Plumbing Installation: Use a suitably licensed plumber where required by Australian state and territory plumbing regulations.

Important: Always follow the manufacturer's installation instructions, pressure limits and plumbing requirements. Use only approved thread-sealing methods specified for the housings and fittings.

Installation Videos

How to Install a Whole House Water Filter

What Tools we use for a Whole House Water Filter Installation

Cartridge Service Life

Stage 1: Pleated Sediment Cartridge

The service life of the 1 Micron Pleated Sediment Cartridge depends on the sediment content of your rainwater supply and the volume of water passing through the filter.

Rainwater tanks containing higher levels of sediment may require more frequent cartridge cleaning or replacement.

• Regular Inspection: Check the cartridge for sediment accumulation.

• Cleaning: Gently rinse the cartridge where permitted by the manufacturer.

• Replacement: Replace when cleaning no longer restores suitable flow or when the manufacturer's recommended interval is reached.

Stage 2: Disruptor® BIO Cartridge - Up to 300,000 Litres

The Disruptor® BIO 20" x 4.5" Cartridge has a stated service capacity of up to 300,000 litres, depending on incoming water quality, usage and operating conditions.

Replace every 12–18 months or at the rated service capacity, whichever comes first, unless the manufacturer's instructions or water conditions require earlier replacement.

Using the pleated sediment cartridge before the Disruptor® BIO helps reduce sediment loading and may help prevent premature blockage.

Important: The five-year housing warranty relates to the filter housings. It does not mean the cartridges can be used for five years without replacement.

Maintenance and Replacement Cartridges

Simple Ongoing Maintenance Helps Keep Your Whole House Filtration System Performing at Its Best.

Regular maintenance is important for any whole-house water filtration system, particularly one treating untreated rainwater.

Recommended Maintenance:

• Inspect the Sediment Cartridge: Check regularly for dirt and sediment accumulation.

• Clean or Replace the Sediment Cartridge: Follow the manufacturer's maintenance instructions.

• Replace the Disruptor® BIO Cartridge: Follow the recommended replacement schedule and rated capacity.

• Monitor Water Flow: A noticeable reduction in water pressure or flow may indicate cartridge blockage.

• Maintain Your Rainwater Tank: Keep roof catchments, gutters, tank screens and storage systems clean.

• Follow Safe Maintenance Procedures: Turn off the water supply, isolate any connected pump as appropriate, release system pressure and follow the housing manufacturer's instructions before servicing.

How to Change the Cartridge in your Whole House Twin Rain Water Filter System

Should I Buy a Twin Replacement Cartridge Pack?

Yes - Purchasing Both Replacement Cartridges Together Makes Maintaining Your Whole House Filtration System Easier.

Our MWF Twin Whole House Rainwater Replacement Cartridge Pack with Disruptor® BIO contains the two cartridges required for this filtration system.

Benefits of Purchasing a Replacement Pack:

• Convenience: Both replacement cartridges are supplied together.

• Correct Cartridge Combination: Receive the 1 Micron Pleated Sediment Cartridge and Disruptor® BIO Cartridge designed for this system.

• Simpler Maintenance: Keep the correct cartridges available when replacements are required.

• Less Time Ordering: Avoid having to locate and purchase the two cartridges separately.

• Ongoing Support: Our team can help you select the correct replacement pack and maintenance schedule.

Keep Your System Performing at Its Best with the Correct Replacement Cartridges.

Automatic Cartridge Replacement Service

We Help Take the Hassle Out of Whole House Water Filtration Maintenance.

At My Water Filter, we want our customers to enjoy the benefits of filtered water without having to worry about remembering every cartridge replacement.

That's why we offer our Automatic Cartridge Replacement Service.

• We Help Track Your Cartridge Replacement Schedule: Making it easier to stay on top of regular filtration maintenance.

• We Contact You When Replacement Is Due: Helping you plan your next cartridge change.

• Convenient Delivery: Once arranged, your replacement cartridges can be delivered directly to your door.

• Ongoing Customer Support: Our team is available to help with cartridge selection and maintenance questions.

Enjoy the Convenience of Ongoing Filtration Support from My Water Filter.

Why Choose This Product?

• Complete Whole House Filtration System: Includes two Big Blue housings and both filtration cartridges.

• Designed for Untreated Rainwater: Suitable for Australian homes relying on collected and stored rainwater.

• Two-Stage Filtration: Combines sediment filtration with advanced Disruptor® BIO contaminant reduction.

• Microbiological Filtration: Disruptor® technology has demonstrated high reduction rates for tested bacteria and coliphage virus surrogates.

• Broad Contaminant Reduction: Targets selected PFAS compounds, heavy metals and fine particles.

• Sediment Protection: The first-stage pleated cartridge helps protect the Disruptor® BIO cartridge from premature sediment blockage.

• No Electricity Required for Filtration: The cartridges operate without an electrical connection.

• Durable Whole House Housings: Includes robust Big Blue filter housings with a five-year housing warranty.

• Optional Stainless Steel Protection: Available with additional mounting and protective cover options.

• Convenient Replacement Cartridges: Compatible twin cartridge replacement packs are available for ongoing maintenance.

• Experienced Australian Support: Backed by the My Water Filter team.

The My Water Filter® Difference

At My Water Filter, we love our products and what we do.

We believe every Australian household deserves access to quality filtration products, reliable information and knowledgeable support.

Our team has years of experience helping customers select water filtration systems suited to their individual water sources.

Whether you're filtering treated city water or untreated rainwater, we're here to help you make informed decisions about your home's water filtration.

Transform Lives Through Clean Water Access

At My Water Filter, our commitment extends beyond our customers and their families.

With every purchase, we contribute 30 days of access to clean drinking water for people in need.

Through our partnership with Buy1GIVE1, your purchase helps support communities that need access to safe drinking water.

Thank you for helping us make a difference, one purchase at a time.

Why Buy from My Water Filter?

Free Delivery Australia Wide
Free Insurance
Our 10 Guarantees
30 Day Money Back Guarantee
5 Years Warranty on Filter Housings