Gardus
Gardus – The Flexible, Leak-Detectable Dual Contained Hose System
Designed for safer, lighter, and more economical chemical transfer
Gardus flexible hose is purpose-built for water treatment applications, safely conveying aggressive, high-concentration chemicals while fully containing leaks. Its dual containment design eliminates risk to personnel and the environment, with no air gaps, catch pots, or hazardous discharge. Proven across potable water, wastewater, and industrial processing environments, it delivers safer, more efficient chemical transfer for critical and regulated applications.
Certified Safe with 15 Years Proven Performance
Safety and Compliance You Can Count On
Suitable for a wide range of demanding water and chemical applications, including:
- Drinking water: AS/NZS 4020 approved and WRAS approved for the conveyance of cold potable water at 23 °C and hot potable water up to 85 °C.
- Potable water & food contact: Manufactured from non-phthalate raw materials with regulatory food contact approval.
- Industrial environments: Certified to RoHS and WEEE, providing environmental compliance.
- Defined Fire Performance: UL94‑V2 and UL94‑HB flammability ratings at 3 mm thickness
- Pressure certified: to BS EN-ISO 5774:2016 and BS EN-ISO 1307:2006.
CERTIFICATION | NAME | DESCRIPTION | BENEFIT |
 | AS/ZS 4020 | Australian standard for products in contact with drinking water | Ensures compliance with Australian drinking water safety requirements; AUS/NZS 4020 approved for drinking water |
 | RoHS & WEEE | Restriction of hazardous substances & waste electrical and electronic equipment compliance | Ensures environmentally responsible manufacturing and disposal |
 | BS EN-ISO5774:2016 | European standard for polyurethane hoses | Confirms quality and durability of hose material |
BS EN-ISO1307:2006 | Standard for chemical resistance and hose performance | Assures safe handling of aggressive chemicals | |
 | UL94-V2 & UL94-HB (@ 3mm thickness) | Flammability standard for plastics at 3mm thickness | Adds safety against ignition or fire hazards |
 | WRAS Approval No. 1504522 | UK Water Regulations approval for potable water (cold at 23 °C and hot up to 85 °C) | Guarantees suitability for drinking water and food contact applications |
For helpful and detailed technical specifications, installation data and compliance information, please refer to the Gardus Catalogue.
What Sets Gardus Apart
Maximum Safety. Minimal Risk. Smart Savings
- Gardus Sentinel is the first leak-detect chemical dosing hose on the market, combining 15 years of proven performance of Gardus Shield with integrated leak detection to deliver Gardus Sentinel.
- In the unlikely event of a chemical leak, the system sends a signal to sound an alarm and shut down the dosing pump, enabling operators to switch to a reserve line. The sensitive detection triggers on minimal leaked liquid, and the durable polyurethane jacket safely contains the leak.
- Approved by major UK water and wastewater companies, Gardus Sentinel reduces environmental risk and installation costs and often eliminates the need for catch pots.
Quality You Can Trust
Durable, Safe and Inspection-Ready
- European-designed and manufactured|
- Proven 15-year no-leak performance
- Clear outer for easy visual inspection
- Available in 6.3–50 mm ID, with coils up to 450 m
- Strong, UV-stable PU outer & PVC and plasticiser free Approved for cold & hot potable water and food contact (EU & USA)
- AS/NZS 4020 & WRAS approved (No. 1504522), BS 6920 tested
The Original Leak-Detect Hose
The first leak-detect hose in Australia
- Fully leak-detectable dual containment system
- Minimal liquid to trigger alarm/alert and shut off
- Integrated Gardus Sentinel alarm with automatic pump shutdown
- Outer containment safely channels and contains any leaked liquid
- The first and most trusted flexible alarm/alert leak-detect chemical dosing hose system in Australia
Safer for People & Environment
Safer, Smarter & More Efficient
- Protect workers from chemical exposure
- Avoid costly chemical wastage and spill incidents
- Safely convey aggressive and high-concentration chemicals
- Prevent contamination spills and environmental damage
- Eliminate the need for mid-line catch pots and low points
- Swaged fittings help control and direct any escaping liquid
Cost-Effective Solution
Efficiency built into every metre
- 33% cheaper to install than rigid pipe*
- 48% lighter than rigid pipe systems*
- Lower shipping, freight and storage costs
- Smaller drum sizes for equivalent lengths
- Pre-assembled dual hose for faster installation
- Lower cost than traditional hose-in-hose and pipe-in-pipe systems
- Reduced packaging and fully recyclable for a lower carbon footprint
*As per supplier specifications and industry-standard comparisons. Actual results may vary.
Fast & Easy to Install
Safer, Lighter & Flexible
- Lightweight and easy to handle
- Dual hose supplied pre-assembled
- Internal diameters from 6mm to 50mm
- Superior flexibility with lower bend radius
- Flexible design suitable for high-traffic areas
- Strong reinforcement with excellent chemical resistance
- Wide operating temperature range (-20°C to +55°C, intermittent to +65°C)
*As per supplier specifications and industry-standard comparisons. Actual results may vary.
Chemical Resistance
Built for demanding environments. Proven for chemical safety.
Gardus hose is engineered to withstand a wide range of aggressive and industrial chemicals, offering outstanding durability and reliability across multiple applications.
Resistant to Most Oxidising & Reducing Agents, Dilute Acids & Alkalis
- Corrosive materials
- Hydraulics and pneumatics
- Water and fluid handling media
- Food and beverage products
- Industrial chemicals and solvents
- Chemical dosing and transfer fluids
- Compressed air and factory air supply
- Coolants and instrumentation fluids
- Agricultural chemicals (including crop spraying)
*Refer to the Gardus catalogue or contact our technical team to confirm specific chemical resistance
Key Performance Advantages
- Handles nearly all corrosives
- Lightweight for easier handling
- Detects if sensor cable is broken
- Fewer fittings and lower labour costs
- No intermediate catchpots required
- Durable PU jacket safely contains leaks
- Reduces cleanup and maintenance time
- Low permeability keeps fluids contained
- Inner hose available in multiple materials
- Chemically inert to most industrial chemicals
- Flexible for installation through existing ducts
- Immediate alarm and pump shutdown on failure
- Continuous lengths up to 450 m reduce fittings
- Capillary action detects leaks in any orientation
- Cost-effective per-metre chemical transfer solution
Purpose-Built Catch Pots
Designed for secure containment. Built for reliability.
- To complement the Gardus dual contained hose system, Allmach offers robust, purpose-built catch pots designed for safe containment and easy installation.
- The standard catch pot measures 450mm x 350mm x 300mm high and features a 50mm mounting flange, which can be positioned for floor or wall mounting. Custom sizes are also available to suit specific project requirements.
Key Catch Pot Features
- EPDM gasket seal for a fully watertight finish
- Manufactured from durable 9mm polypropylene
- Removable clear lid secured with stainless steel screws
- Connection to the isolation valve with a lockable handle via bespoke fittings
- Custom boss fittings with O-ring sealing for 38mm and 50mm DC hose
- Special tank connectors with compression weather seals (up to 32mm DC hose)
There is access in the top for a level sensor (Hawker E14 usually supplied) and a connection in the base for a ½” lockable handle drain valve.
Industries & Applications
Versatile across industries. Engineered for safety. Built for performance.
Gardus is a leak-detect dual containment hose system designed for chemical dosing with a proven record across potable water, wastewater and industrial processing environments.
Trusted for well over a decade, Gardus is widely used in the water treatment, chemical, mining, pharmaceutical, and manufacturing sectors, supporting both new installations and retrofit projects.
At the forefront of the system is Gardus Sentinel, in the unlikely event of a leak the integrated leak alarm will automatically shut down pumps and alert operators via control panel or SMS, ensuring rapid response and maximum safety.
APPLICATIONS
Industrial manufacturing and materials handling systems
Agricultural spraying and nutrient delivery systems
Chemical dosing, transfer, and corrosive fluid handling
Electrical insulation and protective applications
Food and beverage processing, sanitisation, and dispensing
General industrial fluid transfer systems
Heat exchanger and process equipment connections
Hydraulic, pneumatic, and compressed air systems
Industrial coolant and process fluid lines
Industrial manufacturing and materials handling systems
Instrumentation, SCADA, and monitoring systems
Painting, printing, and welding equipment systems
Potable water and beverage distribution systems
Water and wastewater treatment systems
Downloads
Everything You Need to Specify & Install
Access all essential Gardus piping system documentation in one convenient location. Here you’ll find the latest catalogues and supporting documents to assist with specification, installation and project planning. Additional certifications and detailed technical documentation are available on request through the Allmach Technical Department.
Gardus DCH (Dual Containment Hose) FAQs
Welcome to the Gardus FAQs section. Here you’ll find answers to common questions about Gardus products, applications, technical specifications, servicing, and support. We’ve compiled this information to help you better understand our solutions and how they can support your operational requirements. If you can’t find what you’re looking for, our team is always ready to assist, simply get in touch and we’ll be happy to help ?
Pipe is supplied on drums of 450 – 500 metres. However, we can supply lengths of up to 700 metres. Common lengths of 150, 200, 250 metres are readily available, and each coil is tested for electric conductivity and certified before delivery.
Gardus hose systems are pre-assembled dual containment hoses, making them faster to install than traditional rigid pipe or pipe-in-pipe systems. Their lightweight flexible design also simplifies routing through existing infrastructure and reduces labour and installation time.
Gardus Shield can eliminate the need for catch pots when leak detection is already present in the dosing cabinet and POA. Gardus Sentinel normally removes the need for catch pots entirely, as its integrated leak detection triggers an audible and visual alarm and automatically shuts down the dosing pump via the PLC in the event of a leak.
Gardus hose systems typically operate within a temperature range of –20 °C to +55 °C, with intermittent exposure up to +65 °C, depending on the chemical being conveyed and the specific hose configuration.
Gardus is a dual containment flexible hose system designed to safely convey aggressive chemicals in water treatment and industrial environments. It features an inner hose that transfers the chemical and an outer containment layer that safely captures any potential leaks, helping protect personnel and the environment.
Gardus Sentinel detects very small amounts of leaked liquid within the outer containment layer. When liquid is detected, the system sends a signal to activate an alarm and shut down the dosing pump, allowing operators to switch to a reserve line and prevent chemical loss or environmental contamination.
The ID of the Dual Containment Hose is 6mm-50mm. Allmach has exclusive rights to these sizes.
Gardus Sentinel is the first leak-detect chemical dosing hose system available in Australia. It combines the proven Gardus Shield hose with integrated leak detection technology that sends a signal to trigger an alarm and automatically shut down the dosing pump if a leak occurs.
DCH comes with various material inners such as PVC, LDPE and PTFE to cover resistance of most common chemicals used in dosing, such as Sodium Hypochlorite, Ferric and Caustic. Full chemical details are always requested, including concentrations, to ensure that the product is fully fit for purpose. Full chemical resistance charts are available.
Gardus hose technology has over 15 years of proven performance and is widely used across water treatment and industrial facilities. The system is approved by major UK water and wastewater companies and is trusted for critical chemical dosing applications.