Whole House Filter | 3 Stage | Big Blue | Premium

A premium 3-stage whole-house water filter built on the standard Big Blue 20" × 4.5" cartridge format with a white-coated metal frame and two pressure gauges that show inlet and outlet pressure at a glance - the visual signal owners use to time cartridge changes accurately rather than guessing.

Why the Pressure Gauges Matter

The single most common service mistake on whole-house filters is changing cartridges too early or too late. Too early wastes money; too late means cartridges are saturated and contaminants reach the house water. Two pressure gauges (one before the cartridges, one after) make the timing decision objective:

• New, clean cartridges show roughly equal inlet and outlet pressure
• As cartridges accumulate sediment and dirt, the pressure differential grows
• A clear differential - typically once outlet pressure drops noticeably below inlet - means the cartridges are loaded and replacement is due

It's a small spec line that saves real money over the life of the system, and removes the guesswork that leads to early or late changes.

Three-Stage Filtration

• Stage 1 - 5 micron poly sediment filter: removes silt, dirt, sand, rust
• Stage 2 - 5 micron quality GAC: bulk chlorine reduction; granular activated carbon for high contact area
• Stage 3 - 5 micron quality coconut carbon block: secondary polish; coconut-shell carbon for higher surface area per gram than coal-based

Build and Installation

• Housings: Big Blue 20" × 4.5" - the standard Australian whole-house cartridge size
• Frame: white-coated metal for support
• Connections: 1" inlet and outlet - correct size for Australian mains supply lines
• Width: approximately 58 cm (frame and housings combined)
• Includes: plastic spanner for cartridge-housing opening, two pressure gauges, full cartridge set ready out of the box

Professional installation recommended. Mounts at the cold mains supply line at the point of entry.

Where This Tier Fits

• This system ($599): white-coated metal frame, 3-stage, with pressure gauges - the standard premium 3-stage build

What This System Targets

This multi-stage system combines sediment filtration with activated carbon. It is therefore suited to reducing suspended dirt, sand, silt and rust, while also improving chlorine, taste and odour and reducing some organic compounds.

It is not a true water softener and it is not a microbiological disinfection system. Hardness minerals such as calcium and magnesium require ion-exchange softening or membrane treatment, while bacteria, viruses and parasites require an appropriately validated membrane or UV/disinfection stage.