Reverse Osmosis Water Filter System Undersink 5 Stage Compact

Product Code: GT1-89

Availability: Out of stock

Availability: Out of stock



Dimensions: System

H- 38cm
W- 26cm
D- 20cm

Dimensions: Tank

H- 31.5cm (with Tap)
D- 20cm


There is little need to cover the basic facts about Reverse Osmosis these days, as it has become a hot topic in regards to the controversy of Fluoride and even the debate on acidic and alkaline water.

We have introduced this NEW, compact Reverse Osmosis system as a result of our customers recommendations and suggestions.

The challenge for us was to find a space saving filter without compromising the alkaline water benefits of the systems we are renowned for.


Features Include


  • Compact, space saving size! Able to fit under most sinks even when there is a shelf.
  • This system uses the same reliable and high quality 'Quick Change' Cartridge that we have been supplying for over 10 years. We have also introduced 2 new lines: The Reverse Osmosis Membrane which provides the same high quality filtration as our trusted CSM membranes. Followed by a Coconut Carbon Taste and odour cartridge to produce the best quality water
    These 'Quick Change' cartridges are able to be changed by anyone with any level of DIY skill. Our tech team we able to change all filters from scratch in just under a minute! No need to call in qualified plumbers who charge a fortune for less than 5 minutes work.
    These cartridges are simple, clean and effective.
  • The storage tank is a compact 6L which is more than enough for average use. If you require a larger 8 or 12 Litre tank we can organise an upgrade (please contact us prior to purchase)
  • Built in Pressure Limiting Valve (PLV) No need to install or purchase one from a plumber and cop the price inflation, we have included it in this kit free of charge for your convenience. 
    PLV's are required by law on all municipal water supplies and are highly recommended from us as a seller.
  • On top of the quick change cartridges, the system includes built in 'Push Fit' connectors for ease of use. As you can see in the photos provided, they are clearly labelled for foolproof installation. All you need to do is firmly push in the tubing to the designated fitting and the system is ready to go.
    We are unaware of any RO filter system that comes anywhere close to the ease of use as our new 5 Stage RO. With the exception of the drain line and faucet tap installation, there is no other filter on the market that is closer to the term "plug and play'

Stage 1: ST-01 Dirt Sediment Filter

Rating: 1 micron
UPP Filter - suits GT1-66 

"Quick Connect" Connections
Sediment filter used in the new range of quick connect systems. 
The Pre filter is used to protect the life of the more expensive carbon filter in both Reverse Osmosis and Twin Undersink Systems

Stage 2: ST-33 GAC Filter

This filter contains GAC (Granulated Activated Carbon) for chemical extraction before the membrane filter. This filter comes standard with the system but will be replaced by the stage 3 filter to lower the price for our customers. The 2 filters work in the same ways.

Stage 3:ST-CTO Carbon Block Filter

Rating: 1 Micron

This filter provides maximum chemical reduction which assists the life of the more expensive membrane filter. Excess chemicals to the membrane cause degradation and can greatly reduce the life of the filter if not protected by the propper standard pre filtration.

Stage 4: ST-RO50 Reverse Osmosis Membrane

Rating: 0.0001 Micron


Stage 5:ST-CTO Carbon Block Filter

Rating: 1 Micron

Post membrane taste and odour reduction acting as a polishing filter to sweeten the water up after the RO membrane

A final note: You will notice we have not chosen to enclose this system in a sleak casing for aesthetical looks as many other similar products have done. For 2 reasons: It is a huge cost saver for both us as a seller and you as a customer, and because the system remains exposed, it makes it easier to change filters which gives the system the 'plug and play' ability. Having no cover means you may also change the filters without removing the system from under the sink if need be.

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

If you have any questions at all or would like to learn more, don't hesitate to contact one of our friendly techs to help you with your enquiry.


As always, we offer a lifetime warranty on our systems ( As per T's & C's )

This kit comes standard with a 40mm Drain Clamp Kit. 

This filter is the business end of any RO system. This fillter will help to remove bacteria and viruses up to (98%) and will also remove Fluoride



Inorganic Organic Rejection Aluminum 98% Adrazin Over 98% Arsenic 98% Aldrin Over 98% Benzene Over 98% Barium 95% Chlorine Over 98% Cadmium 95% Chloroform Over 98% Calcium 98% DOT Over 98% Chloride 95% Dichlormethane Over 98% Chromium VI 98% Endrin Over 98% Copper 98% Fluoranthene Over 98% Fluoride 95% Herbicides Over 98% Iron 98% Lindane Over 98% Lead 98% Methoxychlor Over 98% Magnesium 98% PCB Over 98% Manganese 98% Pesticides Over 98% Mercury II 85% Perchlorethylene Over 98% Nitrate 90% Phenole Over 98% Potassium 95% Tannic Acids Over 98% Selenium IV 95% Toxaphene Over 98% Silver 98% Trichlorethlene Over 98% Sodium 95% Trihalomethanes Over 98% Strontium 98% V.O.C.'s Over 98% Sulphate 98% Total Dissolved Solids 95% Zinc 98%


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.





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Product CodeGT1-89
Product TypeNo

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