Reverse Osmosis Water Filter System | 4 Stage Undersink

Product Code: GT1-26S

Availability: In Stock Ships In 1 Day!

Availability: In stock

Regular Price: $350.00

Special Price $330.00


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Regular Price: $350.00

Special Price $330.00



4 Stage Reverse Osmosis System

NSF 61 Certification

Complete DIY Kit - all inclusive and ready to install

The Entry Tee included in this kit is the only one you will find that carries full NSF 61 Certification which even surpasses the previously used John Guest Entry Tee

It has a dual swivel inlet + outlet for easy installation. The QuickConnect coupling also features a self locking feature to ensure that the tubing will be safely locked into the tee to avoid accidental disconnection and flooding, a feature not found on the standard brass block and tap.


Heavy Duty Stainless Steel (316) Joining Nipple (NSF 61)
- Dual O-Ring Undersink Housings GT8-0S (NSF 61)
- NEW US made Asprin Filmtech 50GPD Membrane (NSF)
- DM Fit Entry Valve Tee with self locking feature (NSF 61)
- Heavy Duty Black Handel Faucet (NSF)
- Inline Check Valve + 4 Way Shut Off (NSF)

Production rate: 50 GPD under the following conditions:
*Nominal rejection rate 96% 
*500 PPM TDS                  
* TFC Membrane
* Water temperature 21 °C

Technical data:
*Maximum temperature 40°C
*Maximum pressure 700kpa.

Removes suspended matter such as silt, rust sand, algae, sediment, scale particles, dirt and cloudiness from the water

Stage 2
Removes herbicides, pesticides, chlorine, chlorine bi-products and organic chemicals to protect the membrane

Stage 3
50 GPD. Removes98% of impurities including the organic and in-organic chemicals. Such as FLOURIDE!!!

Stage 4
Polishes the water and removes any taste or odour water may have picked up while sitting in the tank

4 Stage Under Sink Reverse Osmosis System Includes: 
Stage 1: Poly Spun Sediment Filter (5 Micron)
Stage 2: Coconut Carbon Block Filter (5 Micron)
Stage 3: 50GPD US made Membrane
Stage 4: Inline GAC Post Filter (5 Micron)

Kit Includes:

  1. 4 Stage RO System
  2. 5m 1/4" Tubing
  3. Black Handle Heavy Duty Faucet
  4. DM Fit Inlet Valve Tee
  5. 12L Storage Tank
  6. Filters + Instructions
  7. 40mm Drain Clamp
  8. 500kPA Pressure Limiting Valve

Organic VS Inorganic:

Contrary to common beliefs, less than 1% of the organic minerals are actually found  in most raw water supplies. With the increase of pollutants, our water supply contains mostly inorganic minerals. Inorganic minerals consist of calcium, iron, magnesium, carbonate and lime compounds, which are not compatible with our bodies. 

The body's cells reject these minerals leaving dissolved inorganic substances (acid crystals - minerals deposits) throughout the body. This accumulation of debris creates more work and trouble for the body, such as arthritis in joints, gallstones, kidney stones and mineral deposits in artery walls.

Organic minerals that are considered soluble, which means the body absorbs sustenance into the cells, are found in our live foods such as fruits & vegetables. One glass of freshly squeezed orange juice would be higher in minerals than 30 gallons of untreated raw water. 

Purified water provides a necessary rinsing treatment for hydration purposes as our body is mostly fluid (over 80% water) and equally important, is to rinse impurities out of our body. Drinking purified water both prevents inorganic minerals from entering our bodies and removes inorganic mineral deposits already there.


Production rate 50 GPD under the following conditions:
• 100psi 
• Water temperature 21 °C 
• 2500 PPM TDS 
(No iron or manganese permitted in feed water - test first) 
• Nominal rejection rate over 96% 
• TFC Membrane

Technical data: 
• Maximum temperature 40°C
• Maximum pressure 700kpa
• System only to be used on biologically safe water supply
• Filter cartridges should be changed regularly
(every 12 months under domestic conditions or every 6 months for commercial purposes) 

Storage Tank Dimensions:

Tank Height:(with stand) 41cm
Tank Height: (without stand) 38.5 cm
Tank Width: 27 cm


Due to the nature of the products we sell, a strict return policy is in place. We work with food grade certified materials that must be un-opened and un-used as to be able to be re-sold.

You will receive a credit of equal amount, less the postage cost to send it to you. 

  • Wrongly purchased items may be returned for a merchandise credit, this applies for but not limited to: Wrong size, wrong system etc.
  • 30 Day return Policy: We will accept returns up to 30 days after the initial purchase, all orders should be checked immediately for damage/fault upon arrival to aid us with the return process.
  • Return shipping is to be paid by the buyer to the address provided
  • Should the item appear faulty or doesn’t work how described, the unit/item must be returned for testing (if requested), the return postage paid by the buyer. If the unit/item is deemed to be faulty, compensation will be provided for the postage cost. If the unit/item is deemed to be in working order and as described, the buyer will need to pay for return postage. 

If you have any questions about our return policy, please contact us before purchase. This will also help to ensure you purchase the correct product that suits your requirements.


Why is the storage tank necessary?
Reverse Osmosis Water Filtration is a slow process where water is forced under pressure, through a membrane wall at 0.0001 Microns. This process cuts the water production back to anywhere between 8 and 10 Litres per hour. The Reverse Osmosis Storage Tank is used to store this filtered water so that when you open up the tap on the sink, you have water on demand for drinking.

What happens when the storage tank is full?
When the storage tank reaches capacity, it triggers a backflow shut off valve located on the back of the system. This valve actively shuts off the incoming water (from the mains inlet). When you then open the tap on the sink, the storage tank will evacuate the pre-filtered water. The shut off valve will then disengage and begin to top up the tank to capacity once more.

How often do I need to change the filters?
As a general rule with RO systems, the first 2 filters (Or pre-Filter) should be replaced strictly every 6 months. This is highly recommended to help prolong the life of the more expensive and important Reverse Osmosis Membrane. If a pre filter is left on for too long, as the efficiency of chemical reduction is reduced, it may begin to let through residual traces of Chlorine through to the membrane. The Reverse Osmosis membrane is susceptible to damage from any number of chemicals that it comes into contact with, thus would begin to deteriorate more rapidly, potentially causing you to replace your membrane prematurely. Undersink models can have varying configurations but on average, all post membrane filters should be changed every 1-2 years.

What is filter protection equipment, and do I need to use it?
 Filter Protection Equipment is an important part of water filtration. Our products are sourced from experienced and reliable manufacturers and also carry the highest level of certification in the water filtration industry. Regardless of Brand, Make, Model or Country of manufacture, water filtration will ALWAYS be the weakest point in your plumbing. The three main causes of water filtration failure are; Overnight pressure surges, Intense Water Hammer Pressure Impacts, and thermal expansion. All of which can be addressed and prevented with a few simple pieces of equipment. A Pressure Limiting Valve is used to buffer the incoming pressure to the Australian Regulation Pressure of 500kPA. This is the minimum requirement for most insurance and warranty validation and is essential when used on Town mains / municipal water. A Water Hammer Arrestor is a copper tube looking device which is commonly found in the laundry (If you have one). It acts to absorb and dissipate pressure spikes in your water lines. Pressure spikes occur from appliances such as the washing machine or dishwasher and can magnify the water pressure tenfold which can cause serious damage to water filtration components. Water hammer gets the name by the distinct sound you hear when the shockwaves rattle loose copper pipes or worn out valves. This is something that is essential to be addressed immediately before installing water filtration. A Pressure Relief Valve is as it sounds. It is pre-set to open once the pressure reaches 110PSI, shooting that pressure/water down the drain line and easing the pressure in your water filter. This is a requirement if you intend to hook up your water filter to a fridge, chiller or ice maker. They are also a good idea to help relieve residual pressure from pressure surges (even if you have a PLV + water hammer arrestor).

What is re-mineralising and is it necessary?
Re-Mineralising or Alkalising are common terms you will hear when reading about Reverse Osmosis. Many sellers will provide you with a song and dance using big words and sales pitches to the point when “you don’t know what it does, but it sounds good”. To put it all into simple terms; The act of re-mineralising or alkalising is simply Raising the pH from an acidic state to a neutral or alkaline state. This is achieved by using a calcite or magnesium based media filter that slowly dissolves trace amounts of inorganics into the water to raise the pH so that it is suitable and recommended for drinking.

Can I install my Water Filter on my own or do I need a Plumber?
For quality assurance and Insurance reasons, we always recommend using a licenced plumber who is familiar with water filtration. This ensures that the installation runs smoothly and is professional. If you fancy yourself reasonable at DIY type projects, we provide you with all the necessary components and instructions you need to conduct the installation yourself. Our technical support team are contactable during business hours on 1300 888 008 should you have any queries about installation.





Additional Information

Product CodeGT1-26S
Product TypeWater Filter
Installation / InstructionClick view to Installation instruction

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