Filter Tubing | 1/4" (6mm) | LLDPE | NSF

The standard 1/4" (6mm OD) water filter tubing used across Australia for RO systems, fridge water lines, ice maker connections, under-sink filtration, and aquariums.

Why LLDPE for Water Filter Tubing

Linear Low-Density Polyethylene is the standard material because it hits the right balance of properties:

• Flexibility - bends to install through tight under-sink runs without kinking

• High pressure rating - handles full mains pressure with significant safety margin

• Chemical resistance - inert to chlorine, chloramines, dissolved minerals

• Easy installation - cuts cleanly, push-fits without preparation

• Inexpensive - keeps RO systems affordable

Competing materials (copper, PVC, PEX) all fail at least one of these criteria for drinking-water filter applications.

Three separate standards:

• NSF/ANSI 42 - drinking-water aesthetic effects (taste, odour, residual chlorine)
• NSF/ANSI 58 - reverse osmosis system component standard
• NSF/ANSI 61 - drinking-water system components, health effects

Carrying all three means the tubing is verified safe for direct potable-water contact under all the conditions a residential RO system creates.

Where This Tubing Goes

Universal - almost every component in a residential RO or fridge filter installation uses 1/4" tubing:

• Mains supply to pre-filter
• Pre-filter to RO membrane
• RO membrane to permeate tank
• Permeate tank to RO faucet
• RO reject to drain saddle
• Fridge water line from mains tap to fridge inlet
• Aquarium top-up lines from RO water source

Length Options

• 5m - single RO install or fridge line replacement
• 10m - RO install with fridge line, or two installations
• 20m - installer pack for multiple jobs
• 50m - trade roll for installer stock

Specifications

• Outer diameter: 1/4" (6mm)

• Material: LLDPE (Linear Low-Density Polyethylene)

• Maximum temperature: 45°C

• Application: RO systems, fridge filters, ice makers, under-sink filtration, aquariums

Installation Cautions

• Keep away from fire - don't use in high-temperature areas (max 45°C)
• Don't bend the tubing at a 90° angle (use elbow fittings for sharp turns)
• Inspect tubing surface before use - no scratches, no foreign objects, no uneven surfaces
• To avoid leaks, cut off the used portion before reuse
• Avoid simultaneous hot and cold use (temperature cycling reduces seal integrity)
• Don't expose to direct sunlight (UV degrades LLDPE over time)