White Double Wall Hydroponic Irrigation Tubing – Cooltube, Ice Line & Ice Tube

White Double Wall Hydroponic Irrigation Tubing is designed for growers who want to reduce unnecessary heat and light exposure throughout their irrigation system. Featuring a reflective white outer layer and light-blocking black inner layer, this specialised tubing offers a significant advantage over conventional black irrigation pipe in warm grow rooms, greenhouses and high-intensity lighting environments.

Commonly known throughout the hydroponics industry as Cooltube, Ice Line, Iceline, Ice Tube, Cool Tube, Cool Pipe or Multiflow Kool Tube, this style of tubing is ideal for carrying water and nutrient solution between reservoirs, pumps, manifolds, drippers and other irrigation components.

The 8mm variant is commonly known as Cooltube, while larger sizes provide the same heat-reflective, light-blocking advantages for higher-volume irrigation and main feed lines.

For Australian hydroponic growers dealing with warm conditions, exposed irrigation lines and powerful grow lighting, white double wall tubing is a simple upgrade that can help create a cooler, cleaner and more stable irrigation system.

Key Features

• Double wall hydroponic irrigation tubing
• Reflective white outer layer
• Opaque black inner layer
• Helps reduce heat absorption compared with conventional black tubing
• Blocks light from penetrating the irrigation line
• Helps discourage algae growth inside tubing
• Ideal for nutrient and water delivery
• Excellent for exposed irrigation lines
• Suitable for hydroponic systems
• Suitable for automated irrigation
• Useful in grow rooms and greenhouses
• Flexible construction for easy system layouts
• Compatible with appropriately sized irrigation fittings
• Available in multiple diameter variants
• 8mm variant commonly known as Cooltube
• Also known as Ice Line, Iceline, Ice Tube, Cool Pipe and Kool Tube
• Can be cut to the required length
• Ideal for replacing conventional black irrigation lines

White Outside. Black Inside.

The effectiveness of this tubing comes from its simple two-layer construction.

Reflective White Outer Layer

The external white surface reflects considerably more radiant energy than conventional black irrigation tubing.

This is especially useful when pipework is exposed to:

• LED grow lights
• HID grow lights
• Direct greenhouse sunlight
• Warm grow rooms
• Hot equipment areas
• High ambient temperatures
• Australian summer conditions

Rather than allowing the irrigation line to become another dark surface absorbing radiant heat, the white exterior helps reduce unnecessary heat gain.

Light-Blocking Black Inner Layer

The inside of the tubing remains black and opaque.

This is important because simply using translucent or inadequately opaque white tubing could allow light into the nutrient solution.

The black inner wall blocks light penetration, helping maintain a dark environment inside the irrigation line.

The concept is simple:

White Outside = Reflect Heat

Black Inside = Block Light

Why Not Just Use Standard Black Irrigation Tubing?

Black irrigation tubing is inexpensive, widely available and perfectly suitable for many applications.

However, black surfaces also readily absorb radiant energy.

In an indoor garden, irrigation tubing can spend many hours directly underneath powerful grow lights. In a greenhouse or outdoor irrigation installation, it may also be exposed to direct sunlight.

As the tubing absorbs energy, heat can transfer into the water or nutrient solution travelling through it.

White double wall tubing is designed to reduce this problem.

It doesn't actively refrigerate your nutrient solution, but it can help reduce unnecessary heat absorption through exposed irrigation lines.

Helps Maintain Cooler Nutrient Lines

Keeping hydroponic nutrient solutions within an appropriate temperature range can be challenging during warm weather.

This becomes even more difficult when irrigation lines are exposed to intense lighting.

White double wall tubing helps reduce one potential source of heat gain by reflecting more radiant energy from its external surface.

This makes it particularly useful for:

• Long irrigation runs
• Exposed feed lines
• Grow rooms with powerful lighting
• Greenhouses
• Warm climates
• Recirculating hydroponic systems
• Irrigation lines positioned close to lighting

Actual temperature differences will depend heavily on ambient temperature, lighting, flow rate, tubing diameter, exposure time and system design.

Helps Block Light & Discourage Algae

The black internal layer serves another important purpose: preventing light from reaching the water inside the tubing.

Light combined with water and available nutrients can encourage unwanted algae development.

By maintaining an opaque internal environment, double wall tubing helps reduce one of the conditions algae require for growth.

This can be particularly useful in hydroponic systems where nutrient-rich water is continually circulating through irrigation lines.

It does not eliminate the need for good reservoir hygiene, filtration and irrigation maintenance, but it provides a more appropriate light-blocking environment than transparent or translucent tubing.

Ideal for Hydroponic Nutrient Delivery

White double wall irrigation tubing can be incorporated into a wide range of hydroponic watering systems.

Typical applications include:

• Reservoir-to-pump connections
• Main nutrient lines
• Irrigation manifolds
• Drip systems
• Recirculating systems
• Run-to-waste irrigation
• Automatic watering systems
• Flood and drain installations
• Container irrigation
• Greenhouse irrigation
• Indoor grow-room irrigation

Choose the appropriate tubing diameter according to the required flow rate and fittings used throughout your system.

8mm Cooltube

The 8mm version is commonly referred to as Cooltube and is ideal for smaller irrigation lines and compatible 8mm fittings.

It provides the same basic dual-layer principle:

Reflective white exterior + opaque black interior

This makes 8mm Cooltube particularly useful for routing smaller irrigation lines through illuminated growing areas.

It can be used wherever its dimensions and pressure requirements are compatible with the irrigation system.

Multiple Sizes for Different Irrigation Requirements

One of the advantages of combining the different diameters into a single product range is that the same heat-reflective concept can be used throughout different sections of an irrigation system.

Smaller Diameter Tubing

Smaller variants are suited to lower-volume irrigation branches and individual feed lines.

Medium Diameter Tubing

Medium sizes can be used for main irrigation feeds, manifolds and systems supplying multiple plants.

Larger Diameter Tubing

Larger sizes are better suited to higher-volume main lines, pumps and larger irrigation networks where greater water flow is required.

Always match the tubing to the actual internal/external diameter requirements of your fittings, rather than assuming fittings from different irrigation systems are interchangeable simply because they share a nominal size.

Ideal for Warm Australian Grow Rooms

Temperature management can become particularly important during warmer Australian conditions.

Even when the main nutrient reservoir is kept away from direct heat, long sections of exposed black tubing can absorb radiant energy as nutrient solution travels through the irrigation network.

Replacing exposed black irrigation lines with reflective white double wall tubing is a simple passive measure that can complement other temperature-management strategies such as:

• Reservoir insulation
• Keeping reservoirs away from grow lights
• Improved room ventilation
• Air conditioning
• Water chillers
• Shorter irrigation runs
• Appropriate reservoir placement

The tubing doesn't replace active cooling where a system genuinely requires it, but it can help avoid adding unnecessary heat in the first place.

Useful Under High-Intensity Grow Lights

Modern grow lights can deliver substantial amounts of energy into the growing area.

Even efficient LED fixtures can create warm environments when operated at high output.

Irrigation lines running directly across grow tables or beneath lighting are continuously exposed to this environment.

The white external surface makes this tubing particularly appropriate for these exposed sections.

Applications include irrigation systems operating beneath:

• LED grow lights
• HPS lighting
• Metal halide lighting
• CMH lighting
• Greenhouse sunlight

Flexible Irrigation Layouts

The tubing's flexible construction allows it to be routed around common hydroponic equipment such as:

• Reservoirs
• Pumps
• Grow tables
• Pots
• Irrigation manifolds
• Grow tent frames
• Benches
• Trays

It can be cut to the required length and connected using appropriately sized irrigation fittings.

For best performance, avoid unnecessary sharp bends and kinks that may restrict water flow.

Great for Recirculating Hydroponics

In a recirculating hydroponic system, the same nutrient solution may repeatedly travel between the reservoir and root zone.

Reducing unnecessary light and heat exposure throughout the irrigation circuit can therefore be particularly useful.

White double wall tubing is well suited to:

• Recirculating drip irrigation
• Flood and drain systems
• NFT support plumbing
• Hydroponic manifolds
• Return/feed configurations
• Automated nutrient delivery

The black inner layer helps keep the inside of the irrigation line dark, while the white exterior reduces radiant heat absorption.

Suitable for Run-to-Waste Irrigation

The tubing is equally useful in run-to-waste hydroponic systems.

It can be used to carry nutrient solution from the reservoir or dosing system toward irrigation manifolds and individual plant feeds.

This makes it suitable for irrigation systems serving:

• Coco
• Rockwool
• Perlite
• Clay pebbles
• Other compatible hydroponic and soilless substrates

White Double Wall Tubing vs Standard Black Tubing

The key advantage is not that ordinary black irrigation tubing is unsuitable. It's that double wall white tubing provides the light-blocking advantages of black tubing while adding a reflective exterior.

Known by Several Different Names

This type of irrigation tubing has acquired several names within the hydroponics industry.

Depending on the manufacturer, supplier, diameter or region, customers may know it as:

• White Double Wall Irrigation Tubing
• Ice Line
• Iceline
• Ice Tube
• Cooltube
• Cool Tube
• Cool Pipe
• Kool Tube
• Multiflow Kool Tube
• White Hydroponic Tubing
• White Irrigation Pipe
• Reflective Irrigation Tubing
• Dual-Layer Irrigation Tubing
• Dual-Core Irrigation Pipe
• White Nutrient Line

These names generally refer to the same core idea: white reflective irrigation tubing with a dark internal layer designed for hydroponic water and nutrient delivery.

Installation

Step 1 – Select the Correct Diameter

Match the tubing size to your pump, fittings, valves, manifolds or irrigation system.

Step 2 – Plan the Irrigation Route

Keep the tubing run as direct as practical while avoiding tight bends and kinks.

Step 3 – Cut to Length

Use a clean, sharp cutting tool to create a straight cut.

Step 4 – Connect the Fittings

Install the tubing onto compatible barbed, push-fit or other appropriate irrigation fittings.

Step 5 – Secure the Tubing

Support longer runs where required to prevent unnecessary movement or strain on connections.

Step 6 – Test the System

Run the irrigation system and inspect every connection for leaks.

Step 7 – Monitor Flow

Confirm that each irrigation outlet receives the expected water flow before relying on the system unattended.

Applications

White Double Wall Hydroponic Irrigation Tubing is ideal for:

• Hydroponic irrigation
• Indoor grow rooms
• Greenhouses
• Automated watering systems
• Nutrient delivery
• Reservoir plumbing
• Drip irrigation
• Recirculating hydroponics
• Run-to-waste systems
• Grow tables
• Coco irrigation
• Rockwool irrigation
• Flood and drain systems
• Irrigation manifolds
• Main feed lines
• Individual plant feed lines
• Warm growing environments

Product Specifications

Why Choose White Double Wall Hydroponic Irrigation Tubing?

A hydroponic system is only as effective as the environment it creates around the roots.

While growers often focus heavily on reservoir temperature, pumps, nutrients and oxygenation, the irrigation lines themselves can be overlooked.

White Double Wall Hydroponic Irrigation Tubing provides a simple passive improvement by combining a reflective exterior with a completely dark interior.

The white outer wall helps minimise radiant heat absorption, particularly where tubing is exposed to grow lights or sunlight.

The black inner wall prevents light penetration, helping discourage algae growth inside nutrient-rich irrigation lines.

There are no moving parts, no electricity consumption and nothing complicated to configure. Simply replace suitable conventional irrigation runs with the appropriate diameter of double wall tubing.

For hydroponic systems, grow rooms, greenhouses and automated irrigation, it's a practical upgrade for growers who want to minimise unnecessary heat and light entering their nutrient delivery system.

Frequently Asked Questions

What is white double wall irrigation tubing?

It is hydroponic irrigation tubing constructed with a white reflective outer layer and opaque black inner layer.

Why is the outside white?

The white exterior reflects more radiant energy than conventional black tubing, helping reduce unnecessary heat absorption when irrigation lines are exposed to strong lighting or sunlight.

Why is the inside black?

The black internal layer blocks light from penetrating through the tubing and reaching the water or nutrient solution.

Is this the same as Ice Line or Ice Tube?

These are common industry names for this type of white, light-blocking hydroponic irrigation tubing.

Is the 8mm version Cooltube?

Yes. The 8mm variant is commonly known as Cooltube and is included within this product range.

Is it also called Kool Tube?

Yes. Kool Tube and Multiflow Kool Tube are other names customers may encounter when searching for similar double-layer white irrigation tubing.

Does the tubing actively cool the water?

No. It is not an active cooling device. The reflective exterior helps reduce heat absorption compared with exposed black tubing, but it does not refrigerate the water.

Will it replace a nutrient chiller?

No. If environmental conditions require active water cooling, a suitable chiller may still be required. Double wall tubing is a passive method of reducing unnecessary heat gain.

Does it help prevent algae?

The opaque black inner wall prevents light from passing through the tubing, helping remove one of the conditions algae need to grow. Good reservoir and irrigation-system hygiene is still essential.

Is it suitable for hydroponic nutrients?

Yes. This type of tubing is designed for irrigation and hydroponic water/nutrient delivery.

Can I use it in a greenhouse?

Yes. The reflective exterior is particularly useful where irrigation lines are exposed to intense light.

Can I use it indoors?

Yes. It is an excellent option for irrigation lines exposed to indoor grow lighting.

What size should I choose?

Choose the diameter required by your existing irrigation fittings and the flow requirements of your system. Don't select solely by the approximate outside diameter of an existing hose—check the required ID/OD and fitting compatibility where possible.

Can I cut it to length?

Yes. Flexible irrigation tubing can be cut to suit the required irrigation layout.

Is white tubing better than black tubing?

Each can work well for irrigation. The advantage of this double wall construction is that it retains an opaque black interior for light blocking while adding a reflective white exterior to reduce radiant heat absorption.