Hydro Guard 4-Stage RO - Quick Change Filters

$688.00 $769.00 Save $81

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For an under-sink installation for designated purified drinking water 


Suited for mains pressure installations

The Hydro Guard HDGT-45 - By Hrydro Gaurd Water Sciences - Ohio USA

boasts a 4-stage reverse osmosis (RO) system, delivering filtration quality equivalent to a 5-stage RO system. It simplifies maintenance with its user-friendly design, featuring four readily replaceable filters. 

The Hydro Guard HDGT-45 is easy to install and requires no tools to change filters, plus it features a 4.5-gallon storage tank. 


  • Eliminates up to 99% of dissolved solids, chlorine, fluoride, microorganisms, and heavy metals such as barium, cadmium, chromium, lead, and mercury
  • Sanitary quick-change cartridges No tools required
  • Flow leak detector shut-off valve silently guards against any water leaks that may occur. 
  • Water Hammer protection system protects your system from water hammer and spikes in water pressure
  • Designer lead-free faucet provides elegance and durability. 
  • 4.5-gallon plastic storage tank
  • NSF-certified materials. 
  • High-performance filters only need to be changed once per year
  • Durable UV-resistant plastic prevents yellowing
  • Quick connect fittings make installation fast, convenient, and sanitary. No tools are required for filter change


  • Flow lock drip tray
  • Shok Blok - designed to protect the RO system from water pressure spikes
  • Twist & turn for simple DIY filter changes
  • Sanitary quick-change cartridges No tools required
  • Flow Lok detector shut-off valve silently guards against any water leaks that may occur. 
  • Water Hammer protection system protects your system from water hammer and spikes in water pressure
  • Faucet - designer lead-free faucet provides elegance and durability. 
  • 17 litres storage tank
  • less
  • less filter changes High performance filters to be changed annually


(In packet)

  1. Feed water adapter
  2. Tank ball valve
  3. Drain saddle

(already connected to the system)

  1. Connection tube
  2. Pre-filter
  3. Carbon filter
  4. Membrane
  5. Post carbon filter
  6. 1 membrane
  7. Inline flow restrictor
  8. Fixed elbow


NSF58 certification completed & pending

Material safety – chemical extraction
Structural integrity – cyclic and hyrdostatic
Contaminant reduction – Total dissolved solids, VOC, cyst, etc.

NSF/ANSI 58 is the American National Standard for point-of-use (POU) reverse osmosis (RO) systems. It was developed by a joint committee with equal representation from regulators, manufacturers and end users. This standard includes requirements addressing various aspects of these systems, including:

  • > Safety of materials in contact with drinking water
  • > Structural integrity
  • > TDS (total dissolved solids) reduction performance
  • > Efficiency rating
  • > Recovery rating
  • > Contaminant reduction performance
  • > Information for the end us


  • Max inlet pressure 80psi
  • Min inlet Pressure 40psi
  • System dimensions H x W x D  318 x 12 x 349 (mm)
  • System weight 2.7kg
  • Tank Dimensions 425 h x 287w (mm)
  • Tank capacity 7-12 litres
  • Tank weight full 18kg
  • Tank pressure should be 8-10psi when empty
  • The tank will take 4 -5 hours to fill  (flush once before use)



  • STAGE 1 – HDGT-SED5 Sediment Pre-Filter – Removes dirt, sand, rust, and other physical particles. - Replace Every 12 Months

    STAGE 2 – HDGT-CB5 Carbon Block Pre-Filter – Removes the chlorine, chloramines, bad tastes, odors, and chemicals - Replace Every 12 Months

    STAGE 3 -  Membrane Removes up to 99% of the total dissolved solids and contaminants. Replace every 24 months

    STAGE 4 – Carbon Post Filter (HDGT-CB5P) – Removes dissolved gases, tastes, and odors from the holding tank water Replace Every 12 Months


  • A remineralizer is generally used to add beneficial minerals back into water, particularly after a process like reverse osmosis which can remove most minerals. This can sometimes result in a slight increase in pH, making the water less acidic. However, the main purpose is not to reduce pH but to improve the mineral content and taste of the water.

Why add this?

Reverse osmosis (RO) water tends to be slightly acidic due to its lack of minerals. In the process of reverse osmosis, most minerals, including alkaline minerals, are removed from the water, resulting in a lower pH level. Generally, RO water tends to have a pH slightly below neutral, but it's important to note that the exact pH may vary depending on specific circumstances. 


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3-Year Limited Warranty


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