3-Stage Big Blue Descale + UV Water Filtration System – 20 Inch, 2720 L/h (Sediment + Carbon Block + Siliphos + 55W UV)

3-Stage Big Blue Descale + UV Water Filtration System – 20 Inch, 2720 L/h

The 3-Stage Big Blue Descale + UV Water Filtration System is a larger point-of-entry / whole-house water filtration system designed for domestic, borehole, agricultural and light commercial water applications where sediment reduction, chlorine reduction, scale control and UV disinfection are required.

Important: this is not a compact under-counter drinking water filter. It is generally installed as either a floor-standing or wall-mounted system in a pump room or protected service area near the main water line. If you require an under-counter drinking water system with a separate counter-top tap, please select a compact under-counter filter or reverse osmosis system instead.

Key Benefits

• Whole-house filtration support: designed to treat water entering the property or selected building supply line.
• 3-stage cartridge filtration: combines sediment filtration, carbon block filtration and Siliphos scale-control treatment.
• UV disinfection: 55W UV steriliser helps reduce bacteria, viruses and microorganisms when water is clear and within the rated flow range.
• Suitable for multiple water sources: commonly used for municipal, rainwater and borehole water applications, depending on water quality.
• High-flow design: rated at approximately 2720 L/h, making it suitable for many residential and light commercial installations.

What This System Is Designed For

• Installation type: point-of-entry / floor-standing or wall-mounted filtration system.
• Typical placement: before the house supply, after a pressure pump, or near the main incoming water line.
• Typical applications: whole-house filtration, borehole water polishing, agricultural water use and light commercial water treatment.
• Not recommended as: a compact under-counter drinking water unit or a small counter-top tap filter.

Filtration Stages

• Stage 1 – Sediment Filtration: assists with reducing sand, silt, rust particles and visible suspended solids.
• Stage 2 – Carbon Block Filtration: assists with reducing chlorine, taste, odour and selected organic contaminants commonly associated with municipal water.
• Stage 3 – Siliphos Scale Control: assists with scale and corrosion control by helping to reduce the effects of hardness minerals in the water.
• Stage 4 – 55W UV Sterilisation: assists with microbial reduction by exposing clear water to ultraviolet light before it enters the supply line.

Technical Specifications

• System type: 3-stage Big Blue cartridge filtration with UV sterilisation
• Filter housing size: 20 Inch Big Blue
• Cartridge configuration: Sediment + Carbon Block + Siliphos
• UV steriliser: 55W UV complete set
• UV chamber length: approximately 960 mm
• Rated flow: approximately 2720 L/h
• Connection size: 1 Inch BSP
• Operating pressure range: 1–8 bar
• Installation position: floor-standing or wall-mounted using the integrated rear mounting bracket
• Power requirement: nearby plug point required for the UV ballast
• Overall Dimensions (Three-Stage Filtration Unit Only): 615 mm (L) × 200 mm (W) × 770 mm (H). These dimensions exclude the UV steriliser, which is packaged separately in a different box.
• Installation Configuration: Floor-standing or wall-mounted using the integrated rear mounting bracket.

Installation Space & Service Clearance

This system requires more space than a compact under-counter unit. Final dimensions depend on the installer’s pipework layout, fittings, bypass arrangement and available wall space.

• Allow sufficient floor and service-area space for the three-stage filtration unit and the separately packaged 55W UV chamber.
• Allow clearance below the Big Blue housings so the bowls can be removed for cartridge replacement.
• Allow straight-line access at the end of the UV chamber so the lamp and quartz sleeve can be removed during servicing.
• The three-stage filtration unit measures 615 mm (L) × 200 mm (W) × 770 mm (H), excluding the UV steriliser. Allow additional service clearance for pipework, valves and UV lamp removal.

Recommended Installation Accessories

The exact accessories required will depend on the site layout and existing plumbing. For a professional installation, we recommend allowing for the following:

• Isolation valves before and after the system
• Bypass line for maintenance and servicing
• Pressure gauges before and after the filter bank
• Non-return valve where required by the installation layout
• Pressure reducing valve if incoming pressure exceeds the system rating
• Correct pipe fittings/adaptors to suit the 1 Inch BSP connections
• Level floor or a structurally suitable wall for securing the mounting bracket
• Nearby electrical plug point for the UV unit
• Optional sample tap or test point before and after treatment

Before You Order

Please confirm the following before purchasing:

• Available floor or wall space and suitable service clearance for the full system
• Required flow rate for the property or application
• Water source: municipal, borehole, rainwater or other
• Incoming pressure and pipe size
• Access to a nearby plug point for the UV steriliser
• Water clarity before UV treatment, especially for borehole or rainwater applications

For borehole, rainwater or poor-quality water, we strongly recommend a water test before selecting a final treatment system. High sediment, iron, manganese, tannins, hardness or turbidity may require additional pre-treatment before this system.

Maintenance Guide

• Replace sediment and carbon cartridges every 3–6 months, depending on water quality and usage.
• Refill or replace Siliphos media once depleted.
• Replace the UV lamp every 12 months, even if the lamp still lights up.
• Inspect and clean the quartz sleeve periodically to maintain UV performance.
• Always switch off the water supply and UV power before servicing.

Important UV Disinfection Note

UV disinfection performance depends on clear water, correct flow rate, a clean quartz sleeve and a functioning UV lamp. UV should not be relied on as the only treatment step where water contains high sediment, colour, iron, manganese or turbidity. Additional pre-treatment may be required depending on water quality.