3 Stage Big Blue Units & Replacements

This collection includes our full range of 3 Stage Big Blue Water Filtration Units as well as the replacement cartridges and accessories needed to keep them running at peak performance. Designed as whole-house or point-of-entry (POE) systems, these units are ideal for treating municipal, borehole, or rainwater sources at high flow rates.

Each 3-stage system typically includes sediment, carbon, and specialty cartridges—effectively removing sand, rust, chlorine, odours, discolouration, and more. Whether you're installing a new unit or restocking your consumables, this collection brings together everything you need in one place.

• Complete 3-stage Big Blue filtration systems (10” & 20” housings)
• Standard cartridge sets (5 micron sediment, carbon block, GAC)
• Optional cartridges: iron removal, Siliphos, calcite, nitrate, etc.
• UV add-ons for disinfection (55W steriliser options available)
• Mounting brackets, spanners, pressure gauges & fittings
• Individual and bulk-pack replacement filter sets available

✔ Suited for homes, farms, lodges & light commercial use
✔ High-capacity filtration at affordable running costs
✔ NSF Certified cartridges available
✔ Quick & easy DIY maintenance

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  • 3 - Stage Big Blue Descale Water Filtration System – 20 Inch, 2720 L/h (5 Micron Sediment + Carbon Block + Siliphos Cartridge) - H2O Warehouse3 - Stage Big Blue Descale Water Filtration System – 20 Inch, 2720 L/h (5 Micron Sediment + Carbon Block + Siliphos Cartridge) - H2O Warehouse

    3-Stage Big Blue Descale Water Filtration System – 20 Inch, 2720 L/h (5 Micron Sediment + Carbon Block + Siliphos Cartridge)

    3-Stage Big Blue Descale Water Filtration System – 20 Inch, 2720 L/h (Sediment + Carbon Block + Siliphos Cartridge) The 3-Stage Big Blue Descale Filtration System is a point-of-entry whole-house water filter that delivers clean, fresh water to every tap while protecting your plumbing...
    R 3,349.00
    R 3,898.00
    R 3,349.00
  • 3 - Stage Big Blue Water Filtration System with 55W UV Steriliser – Includes 2 Sediment & 1 Carbon Block Filters - H2O Warehouse3 - Stage Big Blue Descale + UV Water Filtration System – 20 Inch, 2720 L/h (Sediment + Carbon Block + Siliphos + 55W UV) - H2O Warehouse

    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 (Sediment + Carbon Block + Siliphos + 55W UV) The 3-Stage Big Blue Descale + UV Filtration System is a whole-house water treatment solution that provides clear, safe, and scale-free...
    R 5,398.00
    R 6,229.00
    R 5,398.00
  • 3 Stage 20 - Inch Big Blue Filtration Unit with 55W UV Steriliser (Stainless Steel) | Includes Filters - H2O Warehouse3 - Stage Big Blue Descale + UV Water Filtration System – 20 Inch, 2720 L/h (Sediment + Carbon Block + Siliphos + 55W UV) - H2O Warehouse

    3 Stage 20-Inch Big Blue Filtration Unit with 55W UV Steriliser (Stainless Steel) | Includes Filters

    Upgrade your home’s water system with the H2O Warehouse 3-Stage 20" Big Blue Filtration Unit, now integrated with a high-performance 55W stainless steel UV steriliser. This premium "Point of Entry" system offers comprehensive water purification and disinfection, ensuring safe, crystal-clear water for your entire...
    R 7,898.00
    R 10,653.00
    R 7,898.00
  • 3 Stage 20Inch Big Blue Filtration Unit (Stainless Steel) excl Filters - H2O Warehouse3 - Stage Big Blue Descale Water Filtration System – 20 Inch, 2720 L/h (5 Micron Sediment + Carbon Block + Siliphos Cartridge) - H2O Warehouse

    3 Stage 20Inch Big Blue Filtration Unit (Stainless Steel) excl Filters

    Premium Whole-House Water Filtration – Without Cartridges This high-capacity 3-stage Big Blue system is designed to deliver exceptional water filtration performance for your entire home. Built on a strong stainless steel frame with powder-coated black finish, the system offers flexibility for wall-mounted or freestanding...
    R 5,499.00
    R 7,399.00
    R 5,499.00
  • 3 Stage 20Inch Big Blue Filtration Unit (Stainless Steel) incl Filters - H2O Warehouse3 - Stage Big Blue Descale Water Filtration System – 20 Inch, 2720 L/h (5 Micron Sediment + Carbon Block + Siliphos Cartridge) - H2O Warehouse

    3 Stage 20Inch Big Blue Filtration Unit (Stainless Steel) incl Filters

    Premium Whole-House Water Filtration – Without UV This high-capacity 3-stage Big Blue system is designed to deliver exceptional water filtration performance for your entire home. Built on a strong stainless steel frame with powder-coated black finish, the system offers flexibility for wall-mounted or freestanding...
    R 5,898.00
    R 8,097.00
    R 5,898.00
  • 3 Stage Big Blue Water Filtration System with Advanced 65W WONDER® Germicidal UV Sterilizer - H2O WarehouseWONDER ULTRAVIOLET Germicidal UV Steriliser, NSF Certified, 65W, 3024 Litres Per Hour, 1 - Inch Male - H2O Warehouse

    3 Stage Big Blue Water Filtration System with Advanced 65W WONDER® Germicidal UV Sterilizer

    Protect your home’s water supply with this high-performance 3 Stage Big Blue Water Filtration System, complete with an advanced 65W WONDER® Germicidal UV Sterilizer for thorough disinfection. Designed to handle municipal or rainwater sources, this system is ideal for households concerned about sediment, chlorine,...
    R 7,999.00
    R 10,599.00
    R 7,999.00
  • 3 - Stage Big Blue Water Filtration System with 55W UV Steriliser – Includes 2 Sediment & 1 Carbon Block Filters - H2O Warehouse3 - Stage Big Blue Descale + UV Water Filtration System – 20 Inch, 2720 L/h (Sediment + Carbon Block + Siliphos + 55W UV) - H2O Warehouse

    3-Stage Big Blue Water Filtration System with 55W UV Steriliser – Includes 2 Sediment & 1 Carbon Block Filters

    The 3-Stage Big Blue Water Filtration System with 55W UV Steriliser provides a comprehensive water purification solution, ensuring clean, safe, and bacteria-free water for residential, commercial, and industrial applications. With two sediment filters (5-micron & 1-micron) and a carbon block filter, this system effectively...
    R 4,398.00
    R 5,129.00
    R 4,398.00
  • 3 - Stage Big Blue Water Filtration System – 20 Inch, 2720 L/h (1 & 5 Micron Sediment + Carbon Block Filters) - H2O Warehouse3 - Stage Big Blue Descale Water Filtration System – 20 Inch, 2720 L/h (5 Micron Sediment + Carbon Block + Siliphos Cartridge) - H2O Warehouse

    3-Stage Big Blue Water Filtration System – 20 Inch, 2720 L/h (1 & 5 Micron Sediment + Carbon Block Filters)

    The 3-Stage Big Blue Water Filtration System is a high-capacity water filtration solution designed for residential, commercial, and light industrial applications. This system processes up to 2720 litres per hour, effectively removing sediment, chlorine, and other contaminants, delivering clean, safe, and great-tasting water. Equipped...
    R 2,489.00
    R 2,898.00
    R 2,489.00
  • O - Ring Set for 3 Stage 20 Inch Big Blue Filter Unit | 6 units - H2O Warehouse
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    O-Ring Set for 3 Stage 20 Inch Big Blue Filter Unit | 6 units

    Replacement O-Ring Kit for Big Blue Housing Seals Ensure leak-free performance and proper pressure sealing with this 6-piece O-ring replacement set for the 3-stage 20-inch Big Blue filter housing system. Product Features: High-Quality EPDM Material: Durable and chemical-resistant for long-lasting performance. Double O-Ring Design:...
    R 580.00
    R 720.00
    R 580.00
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  • 55W UV Sterilizer Complete Set | 960mm | 2700 LPH | Water Disinfection System - H2O Warehouse3 - Stage Big Blue Descale + UV Water Filtration System – 20 Inch, 2720 L/h (Sediment + Carbon Block + Siliphos + 55W UV) - H2O Warehouse

    55W UV Sterilizer Complete Set | 960mm | 2700 LPH | Water Disinfection System

    he 55W UV Sterilizer Complete Set (960mm, 2700 LPH) is a high-efficiency ultraviolet water purification systemdesigned to eliminate bacteria, viruses, and harmful microorganisms, ensuring clean and safe water for homes, businesses, and industrial applications. This system uses powerful UV-C light technology to neutralise pathogens without...
    R 2,135.00
    R 2,999.00
    R 2,135.00
  • Combo 55W UV Sterilizer Complete Set + Replacement Lamp | Water Disinfection System - H2O Warehouse3 - Stage Big Blue Descale + UV Water Filtration System – 20 Inch, 2720 L/h (Sediment + Carbon Block + Siliphos + 55W UV) - H2O Warehouse

    Combo 55W UV Sterilizer Complete Set + Replacement Lamp | Water Disinfection System

    The Combo 55W UV Sterilizer Complete Set with Replacement Lamp is a high-efficiency ultraviolet water purification system designed to eliminate bacteria, viruses, and harmful microorganisms, ensuring clean, safe water for homes, businesses, and industrial applications. This complete set includes a 55W UV Sterilizer Unit...
    R 2,689.00
    R 3,669.00
    R 2,689.00
  • Replacement Quartz Sleeve/Thimble for UV Sterilizer – 55W | 23mm x 940mm | Single Open End - H2O Warehouse

    Replacement Quartz Sleeve/Thimble for UV Sterilizer – 55W | 23mm x 940mm | Single Open End

    The Replacement Quartz Sleeve/Thimble for 55W UV Sterilizers (23mm x 940mm, Single Open End) is an essential component designed to protect the UV lamp from water exposure while allowing maximum UV transmission for effective sterilization. Made from high-quality, high-clarity quartz, this sleeve ensures optimal...
    R 595.00
    R 628.00
    R 595.00
  • UV Sterilizer Replacement Lamp Set (220W) - H2O Warehouse

    UV Sterilizer Replacement Lamp (55W)

    UV Sterilizer Replacement Bulb (55W) for 55W UV Sterilizer. Replacement Bulb for 55W UV Sterilizer Complete Set, 960mm, 2700 LPH UV bulbs should be replaced every 10 months Adding a UV sterilizer onto a water filtration system is a well-known practice in domestic, commercial...
    R 597.00
    R 664.00
    R 597.00
  • Replacement Ballast for 55W UV Sterilizer - H2O Warehouse

    Replacement Ballast for 55W UV Sterilizer

    Ballast for 55W UV Sterilizer Complete Set, 960mm, 2700 LPH Voltage: 200-240V 60Hz Includes fault light to indicate operational status *It is always recommended that installations are done by certified plumbers **Due to the sensitive nature of electrical products, consumables such as bulbs and ballasts...
    R 589.00
    R 875.00
    R 589.00
  • DARLLY Premium - Big Blue Water Filter Replacement Pack, 20 Inch (5 Micron PP, Carbon Block & 1 Micron PP) - H2O Warehouse

    Big Blue Water Filter Replacement Pack, 20 Inch (5 Micron PP, Carbon Block & 1 Micron PP)

    Replacement cartridges will fit any 20 inch Big Blue water filter system Stage 1: Sediment filter (5 Micron), removes mud, rust, dirt, floating particulates or any other large particlesStage 2: Carbon block filter reduces fine sediment, chlorine taste and the concentration of heavy metals such...
    R 589.00
    R 759.00
    R 589.00
  • DARLLY Premium - Big Blue Water Filter Replacement Pack, 20 Inch (5 Micron PP, Carbon Block & 1 Micron PP) - H2O WarehouseDARLLY Premium - Big Blue Water Filter Replacement Pack, 20 Inch (5 Micron PP, Carbon Block & 1 Micron PP) - H2O Warehouse

    DARLLY Premium - Big Blue Water Filter Replacement Pack, 20 Inch (5 Micron PP, Carbon Block & 1 Micron PP)

    Replacement cartridges will fit any 20 inch Big Blue water filter system Stage 1: DARLLY sediment filter (5 Micron), removes mud, rust, dirt, floating particulates or any other large particlesStage 2: Carbon Block 800mg/g filter reduces fine sediment, chlorine taste and the concentration of heavy metals...
    R 699.00
    R 759.00
    R 699.00
  • DARLLY Premium - 3 Pack Big Blue Water Filter Replacement, 20 Inch (3x5 Micron PP, 3xCarbon Block & 3x1 Micron PP) 9 Items - H2O Warehouse

    3 Pack Big Blue Water Filter Replacement, 20 Inch (3x5 Micron PP, 3xCarbon Block & 3x1 Micron PP) 9 Items

    Replacement cartridges will fit any 20 inch Big Blue water filter system Stage 1: 3x sediment filter (5 Micron), removes mud, rust, dirt, floating particulates or any other large particlesStage 2: 3x carbon block filter reduces fine sediment, chlorine taste and the concentration of heavy...
    R 1,599.00
    R 2,277.00
    R 1,599.00
  • DARLLY Premium - 3 Pack Big Blue Water Filter Replacement, 20 Inch (3x5 Micron PP, 3xCarbon Block & 3x1 Micron PP) 9 Items - H2O Warehouse

    DARLLY Premium - 3 Pack Big Blue Water Filter Replacement, 20 Inch (3x5 Micron PP, 3xCarbon Block & 3x1 Micron PP) 9 Items

    Premium DARLLY Replacement cartridges will fit any 3 Sage 20 inch Big Blue water filter system Stage 1: 3x DARLLY meltblown sediment filter (5 Micron), removes mud, rust, dirt, floating particulates or any other large particlesStage 2: 3x Carbon Block 800mg/g filter reduces fine...
    R 1,999.00
    R 2,389.00
    R 1,999.00

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