20" Jumbo 5 Micron Carbon Block Water Filter Cartridge

Improve your water with a 20" Jumbo 5 micron carbon block water filter cartridge, combining fine sediment filtration with activated carbon treatment in one high-capacity cartridge.

The larger 20" Jumbo format provides substantial carbon media for whole-house and higher-demand water filtration systems.

Choose Standard Waimana for dependable 5 micron carbon block filtration with a rated flow of up to 75 L/min, or Premium Davey Microlene for high-capacity carbon treatment with a 42 L/min maximum flow rate, 19 L/min optimal treatment flow, and documented treatment capacity of up to 90,800 litres.

Product Options

Standard — Waimana 20CTO05

The Waimana 20CTO05 combines activated carbon block media with 5 micron filtration in a high-capacity 20" Jumbo cartridge.

Its activated carbon block provides water treatment while also helping capture fine suspended sediment as water passes through the cartridge.

With a rated flow of up to 75 L/min, the larger 20" format is well suited to whole-house and higher-demand residential filtration systems.

Choose Standard when you want dependable carbon block filtration, strong water flow and a cost-effective 20" Jumbo cartridge.

Premium — Davey Microlene ACB20J

The Davey Microlene ACB20J is a high-capacity activated carbon cartridge designed for applications where drinking-water quality and treatment capacity are priorities.

Its bonded powdered activated carbon media combines 5 micron nominal filtration with reduction of:

• Chlorine
• Unpleasant taste
• Odour
• Pesticides
• Dissolved chemicals
• Sediment

The ACB20J has a maximum flow rate of 42 L/min, with an optimal treatment flow of 19 L/min and a documented treatment capacity of 90,800 litres. The lower optimal treatment flow provides greater contact time between the water and activated carbon for contaminant reduction.

Its high-capacity porous carbon block helps maintain water movement through the media while reducing sediment plugging, helping maximise the useful life of the carbon.

Why Choose This Water Filter Cartridge?

• 5 micron filtration — captures fine suspended sediment as water passes through the cartridge.
• Activated carbon treatment — provides carbon treatment alongside particulate filtration.
• 20" Jumbo format — provides greater media capacity for larger water systems.
• 75 L/min Standard flow — strong flow capacity for whole-house applications.
• 42 L/min Premium maximum flow — provides substantial flow capability when required.
• 19 L/min Premium optimal treatment flow — provides greater carbon contact time when contaminant reduction is the priority.
• 90,800 L Premium treatment capacity — substantial documented water-treatment capacity.
• Taste and odour reduction — Premium Davey targets common drinking-water quality issues.
• Chlorine and chemical reduction — Premium Davey provides documented reduction of chlorine, pesticides and dissolved chemicals.

How It Works

Water passes through the activated carbon block, where sediment filtration and carbon treatment happen together.

The 5 micron structure captures fine suspended particles, while the activated carbon media treats the water as it moves through the cartridge.

Activated carbon provides a large internal surface area for water treatment. The Premium Davey uses a high-capacity bonded carbon block designed to reduce chlorine, taste, odour, pesticides, dissolved chemicals and sediment.

For carbon treatment, contact time matters. The Davey can flow at up to 42 L/min, while its 19 L/min optimal treatment flow provides more contact time between the water and activated carbon.

Best Suited For

This 20" Jumbo 5 micron carbon block water filter cartridge is well suited to:

• Whole-house water filtration
• Drinking water filtration
• Larger residential water systems
• Town-supply water
• Taste and odour treatment
• Chlorine reduction
• Fine sediment filtration
• Tank-water treatment systems
• Final-stage water filtration
• Beverage applications
• Food-industry water treatment
• Commercial drinking-water systems
• Applications requiring greater carbon capacity

The Premium Davey is particularly useful where documented contaminant reduction and high treatment capacity are priorities.

Key Specifications

Standard vs Premium — Which Should I Choose?

Choose Standard Waimana if you want:

• 5 micron carbon block filtration
• Activated carbon treatment
• 75 L/min rated flow
• A high-capacity 20" Jumbo cartridge
• Fine sediment filtration and carbon treatment in one stage
• Strong whole-house water flow
• A practical, cost-effective replacement cartridge

For general whole-house carbon filtration, Standard provides the core benefits of a 5 micron activated carbon block with strong flow capacity.

Choose Premium Davey if you want:

• 90,800 L documented treatment capacity
• 42 L/min maximum flow
• 19 L/min optimal treatment flow
• Reduction of chlorine
• Reduction of taste and odour
• Reduction of pesticides
• Reduction of dissolved chemicals
• 5 micron nominal sediment filtration
• High-capacity bonded activated carbon
• Maximum operating temperature of 82.2°C

The main reason to choose Premium is documented carbon-treatment performance and substantially greater treatment capacity.

Understanding Maximum vs Optimal Flow

The Waimana 20CTO05 has a rated flow of up to 75 L/min.

The Davey ACB20J has two useful flow figures:

Maximum flow: 42 L/min

This is the maximum flow rate of the cartridge.

Optimal treatment flow: 19 L/min

This is the flow rate to target when maximising the treatment performance of the activated carbon.

Carbon treatment relies on contact time between the water and activated carbon. Running at the lower optimal treatment flow gives the water more time in contact with the carbon media.

Installation

This cartridge is designed for use in a compatible 20" Jumbo water filter housing.

To replace the cartridge:

1. Turn off the water supply.
2. Release pressure from the filter housing.
3. Remove the filter housing sump.
4. Remove the existing cartridge.
5. Clean the housing if required.
6. Check that the O-ring is clean and seated correctly.
7. Insert the new carbon cartridge.
8. Reassemble the housing.
9. Slowly restore water pressure.
10. Check the housing for leaks.

New carbon cartridges should be flushed before the water is used for drinking.

For the Davey ACB cartridge, run water through the new filter for at least 5 minutes after installation to clear carbon fines.

Maintenance

Carbon cartridges should be replaced as the activated carbon reaches the end of its effective treatment life.

Actual cartridge life depends on water quality, water consumption, flow rate and the concentration of contaminants being treated.

Standard — Waimana

Replace around every 12 months, or sooner if water quality noticeably reduces.

Premium — Davey Microlene

The Premium Davey ACB20J provides a documented treatment capacity of up to 90,800 litres.

Replace the cartridge when unwanted taste, odour or the chemical being treated becomes noticeable in the filtered water. For the best contaminant-reduction performance, operate within the recommended optimal treatment flow.

What's Included

1 × 20" Jumbo 5 Micron Carbon Block Water Filter Cartridge

Choose from:

Standard — Waimana Water 20CTO05

or

Premium — Davey Microlene ACB20J

Frequently Asked Questions

What does a carbon block water filter do?

A carbon block cartridge combines activated carbon treatment with fine sediment filtration.

The cartridge captures particulate matter while the activated carbon treats the water as it passes through the media.

The Premium Davey specifically provides reduction of chlorine, taste, odour, pesticides, dissolved chemicals and sediment.

What does 5 micron mean?

The 5 micron rating describes the particulate filtration level of the cartridge.

It provides fine sediment filtration while the activated carbon performs the additional water-treatment process.

What's the difference between Standard and Premium?

The Standard Waimana provides 5 micron activated carbon block filtration with a rated flow of up to 75 L/min.

The Premium Davey provides 5 micron nominal filtration plus documented reduction of chlorine, taste, odour, pesticides and dissolved chemicals. It has a 42 L/min maximum flow rate, 19 L/min optimal treatment flow, and 90,800 litre treatment capacity.

Which option should I choose?

Choose Standard Waimana for general whole-house carbon filtration where strong water flow and value are priorities.

Choose Premium Davey where documented contaminant reduction and high carbon-treatment capacity are more important.

What is the Davey maximum flow rate?

The Davey ACB20J has a maximum flow rate of 42 L/min.

Its optimal treatment flow is 19 L/min.

Why is the optimal flow lower than the maximum flow?

Activated carbon treatment benefits from contact time.

Operating around the 19 L/min optimal treatment flow gives the water more time in contact with the carbon media than operating at the cartridge's 42 L/min maximum flow.

How much water can the Premium Davey treat?

The Davey ACB20J has a documented treatment capacity of 90,800 litres.

Actual cartridge life will also depend on incoming water quality, contaminants and usage.

Does it help with chlorine taste and smell?

Yes. The Premium Davey ACB20J is designed to reduce chlorine, unpleasant taste and odour, helping improve drinking-water quality.

Should I install a sediment filter before a carbon block?

For water with higher sediment levels, installing a dedicated sediment cartridge before the carbon block can help protect the carbon media.

The sediment stage captures dirt and suspended particles first, leaving the carbon cartridge to focus on water treatment.

Do I need to flush a new carbon cartridge?

Yes. Flushing clears loose carbon fines from a new cartridge.

For the Premium Davey, run water through the new cartridge for at least 5 minutes after installation.

Why choose a 20" Jumbo instead of a 10" Jumbo carbon cartridge?

The larger 20" Jumbo format provides more carbon media and greater treatment capacity, making it better suited to higher-use systems.

For example, the Premium Davey ACB20J provides a 90,800 L treatment capacity, compared with 45,400 L for the 10" Jumbo ACB10J.

Will this fit a 20" Jumbo housing?

Yes. These cartridges are designed for a compatible 20" Jumbo water filter housing.