Twin Undersink Water Filter System - (GT1-46WM)

This Twin Undersink Water Filter System delivers reliable two-stage filtration for homes on either mains or rainwater supply. Designed for performance and simplicity, it offers an excellent foundation for improving the taste, clarity, and quality of your drinking water — all in a compact, undersink-friendly format.

The system includes a 5 micron polyspun gradient sediment filter followed by a 1 micron 100% coconut carbon block, both manufactured by High Performance Filtration (HPF). These filters work together to reduce dirt, rust, chlorine, taste, odour, and volatile organic compounds (VOCs), helping ensure safe, pleasant-tasting water straight from the tap.

Filter 1: Gradient Polyspun Sediment Filter – 5 Micron PP2510-05 (GT2-2K)

Installed as the first stage, this three-layer depth filter uses a true gradient structure (20µm → 10µm → 5µm) to trap sediment efficiently across multiple layers. Larger particles are caught in the outer layer, while finer sediment is captured deeper within the matrix — improving filter longevity and protecting downstream components.

Ideal for reducing rust, silt, dirt, and scale, it performs well on both mains and tank water supplies and enhances the performance of the carbon stage that follows.

Filter 2: 100% Coconut Shell Carbon Block – 1 Micron CTO2510-01 (GT4-6CTO)

The second stage is a 1 micron activated coconut carbon block, made exclusively from 100% coconut shell carbon for high adsorption efficiency and low pressure drop. This filter is designed to remove chlorine, taste, odour, and a wide range of chemical residues.

It has been tested in accordance with NSF/ANSI 53 for VOC (Volatile Organic Compound) reduction by the Water Quality Association (WQA), confirming its effectiveness as a Point-of-Use Drinking Water filter. Free of coal-blend fillers, this HPF filter provides high-performance chemical reduction with excellent flow characteristics.

Kit Contains

• 2 × 10" x 2.5" WaterMark Certified Filter Housings (GT8-14)

• 1 × 5 Micron Gradient Polyspun Sediment Filter (GT2-2K)

• 1 × 1 Micron Coconut Carbon Block Filter (GT4-6CTO)

• 1 × White Powder-Coated Steel Mounting Bracket

• 1 × GT9-2S Chrome Modern Goose Neck Drinking Water Tap

• 1 × WaterMark Approved Pressure Limiting Valve (350 kPa)

• 1 × Leak Shut-Off Valve

• 1 × Feed Water Valve

• Tubing, Push-Fit Connectors & Housing Spanner

• Comprehensive Installation Instructions

• Optional Tap Upgrade: Additional Styles &/Or 3-Way Mixer Tap (charges apply)

WaterMark Certification

This system is WaterMark Certified to AS 3497:2021 under Certificate Number 23247 – the mandatory certification standard required for any water filter system installed by a licensed plumber in Australia.

WaterMark certification ensures compliance with Australian plumbing regulations, confirming that all materials and fittings meet strict safety and quality standards. Systems are assembled in Australia and undergo batch testing to ensure consistent performance and durability.

Certification covers structural pressure integrity and requires all components — including filters — to comply with relevant health-based standards such as NSF/ANSI 42 or higher.

⚠️ Beware of non-certified systems – uncertified installations may pose health risks and could invalidate home insurance under Australia’s Plumbing and Drainage laws.

Installation Note:
This system must be installed by a licensed plumber in accordance with AS 3497. Full installation instructions are included in the box.