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Compact Alkaline Reverse Osmosis Water Filter System – Undersink 3 Stage | 380LPD (GT1-CRO)
- High Output RO Membrane - 380L/Day
- Removes Chlorine and Fluoride + More - Pure Reverse Osmosis Water
- Alkaline Remineralisation - Adds Calcium, Magnesium and Potassium
- Compact & Tidy - Uses Inline Quick Connect Filters - No Bulky Housings
- Economical to Own and Maintain - As little as 50c per day in filter maintenance
- Australian Assembled - Built locally with Australian Compliant components
- WaterMark Certified - AS 3497:2021 | AS 4020 | AS/NZS 3718 | AS 3707
- Easy DIY Maintenance - Simple Quick Connect Filters
Compact Alkaline Reverse Osmosis Water Filter System – Undersink 3 Stage | 380LPD (GT1-CRO)
Australian-assembled 3-stage undersink Reverse Osmosis system with compact inline filters, high daily output (380L), and built-in alkaline remineralisation. Efficient, economical, and designed for homes seeking clean, healthy, great-tasting water – without the bulk.
Upgrade your drinking water with this compact 3-stage Alkaline Reverse Osmosis System, assembled right here in Australia using trusted components from Filter Systems Australia (FSA) and High Performance Filtration (HPF).
Designed for space-saving installation under your sink, this RO system delivers up to 380 litres per day (100 GPD) of purified water and reintroduces healthy minerals including calcium, magnesium, and potassium to balanced pH and improved taste.
Thanks to its inline quick-connect cartridge design, replacing filters is fast and clean – no messy housing removal required.
Ideal for households seeking fluoride removal, this system also targets chlorine, heavy metals, VOCs, and many other common water contaminants, providing safer, cleaner, mineral-rich water straight from your tap.
Filtration Stages
Stage 1: 10" Inline Coconut Shell Activated Carbon Filter
Removes chlorine, tastes, odours, and protects the RO membrane.
Stage 2: 100GPD Reverse Osmosis Membrane
Removes fluoride, heavy metals, salts, VOCs, pesticides, and up to 98% of TDS. NSF/ANSI 58 compliant.
Stage 3: Inline GAC + Alkaline Mineral Filter (2-in-1)
Polishes the taste, elevates pH, and reintroduces beneficial minerals for better hydration and taste.
Faucet Tap Options
All of our under-sink RO systems come with a dedicated drinking water faucet tap as standard – which means you will need to drill a hole into your sink or benchtop to install it. Alternatively, you can swap out your current faucet for a 3-way mixer tap, which includes all 3 lines in the one faucet (Hot, Cold & Filtered) – this is a great option for those who don’t want to drill (i.e. if you have a stone benchtop), and it also looks nice and minimalistic.
RO Water Storage Tank Options
Because Reverse Osmosis membranes filter down to such a fine micron rating (0.0001 of a micron), they produce water at a very slow rate (on average 8 litres PER HOUR). This is why all plumbed-in RO systems come standard with a dedicated drinking water tap, and a water storage tank. Your water usage requirements and under-sink space can help determine which sized tank to choose from. Consider that the average person should drink 2L of water per day, and that the system will automatically re-fill at a rate of 8 litres per hour. Choose from a Small, Medium or Large (Standard) tank - the tank dimensions can be seen in the image below:
WaterMark Certification
This Reverse Osmosis system is WaterMark Certified to AS 3497:2021 under Certificate Number 23247 – the mandatory certification standard required for any water filter system installed by a licensed plumber in Australia.
WaterMark certification ensures your system complies with Australian plumbing regulations, giving you confidence that every component meets strict safety and quality requirements. Our WaterMark-certified systems are hand-assembled in Australia and undergo batch testing to ensure consistent quality and workmanship.
This certification covers not only the structural integrity of materials under pressure, but also mandates that all components – including filters – comply with relevant health-based standards such as NSF/ANSI 42 or higher.
⚠️ Beware of non-certified systems – using uncertified water filters can pose health risks and may lead to voided insurance claims under Australia's Plumbing and Drainage Laws.
Installation Note:
This system must be installed by a licensed plumber in accordance with Australian Standards (AS 3497). You can simply order online with free shipping to your home, and any local licensed plumber will be able to complete the installation. Full installation instructions are included in the box.
Kit Includes:
- Compact 3 Stage RO System - Pre/Post Filter Installed
- 100GPD RO Membrane - (Needs to be installed)
- Pressure Tank
- Faucet Tap
- Comprehensive Fitting Kit & Instructions
Filter Maintenance
| Stage 1 Pre Filter - GT6-21S | Every 6 Months or 2,500L |
| Stage 2 Membrane - GT13-37-ALP | 1 - 4 Years depeding on water quality |
| Stage 2 Alkaline - GT6-35C | Every 12 Months or 5,500L |
Average annual filter cost is low – less than $0.50 per day to maintain clean, Alkaline water all year round.
| Parameter | Details |
|---|---|
| Daily Production | 100 GPD / ~380 Litres |
| Tank Holding Capacity | 6–8 Litres (Medium Tank) |
| System Dimensions (cm) | 36W x 20H x 11D |
| Tank Dimensions (cm) | 42H x 23D |
| Installation | Undersink (Wall Mount Brackets) |
| Certification | AS 3497:2021, NSF 58 Membrane |
| Connection Size | ¼” Push-Fit |
Return Policy
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 may receive a refund or credit of equal amount, less the restocking fee if applicable and any other deductions that are relevant.
- 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: Returns will not be accepted without prior approval or after 30 days of invoice date.
- All returns will incur a 17.5% restocking fee or cost to send the item to you whichever greater. FSA may use discretion to determine the restocking fee.
- Any damages (minor, that can be repaired) will incur a fee which will be deducted from the total refund which will be equal to the cost of the replacement
parts (List Price) and labour charge (if applicable) to repair the system(s). This will be separate to the restocking fee. - Any damage considered to be major and not feasible for repair may be refused and the return request will be void. The customer will be responsible for the return freight or disposal of the damaged unit.
- Return shipping is to be paid by the buyer to the address provided. It is recommended that the customer applies transit warranty to the return freight in case of damage.
- Any damages to the system that were not reported to FSA within 48 business hours of receipted delivery are not covered under our transit warranty.
- 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 (Proof of cost required). If the unit/item is deemed to be in working order and as described, the buyer will responsible 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.