Reverse Osmosis Systems for Home
Illi Water offers a wide range of advanced Reverse Osmosis water filter systems, which can be ordered and delivered anywhere in Canada. Our Collection of RO water filters features compact, space-saving designs and eliminates 99% of harmful contaminants. With our RO systems for homes, experience pure, clean, and healthy water right at your tap.
Expert support
Reach our experts anytime, day or night
Shop Now - Pay Later
Buy today, split payments over easy months
90 Day Return
Not satisfied? Return it within 90 days
Fast and Free Shipping
Get free shipping, delivered fast and tracked
Our RO Systems are Built for Modern Homes
Our reverse osmosis water filters are designed considering the demands of today’s modern families. They are sleek, convenient to use, easily fit under the sink, and function flawlessly. Here’s why homeowners in Canada absolutely love our under-the-sink water filters.
- Low Maintenance: Our cutting-edge RO filters are extremely easy to maintain. Their streamlined design requires fewer filter changes and makes servicing straightforward.
- High Flow Rate: Our reverse osmosis systems feature a high water flow rate. With the right pressure, all your chores become easy, be it cooking, cleaning, or washing.
- Space-Saving Design: Our RO systems fit neatly under the sink and tuck in without compromising your kitchen’s aesthetics. With more space on the counter, it is easier to organize your kitchen.
- Easy Installation: All our systems are easy to install yourself and come with detailed, easy-to-follow instructions, making installation a breeze.
Compare Our Reverse Osmosis Systems
Choosing the right RO system for your home shouldn’t be difficult. Our quick guide below makes it easier to compare models and features so you can pick the best reverse osmosis water filter for your budget, needs, and style.
Tankless Reverse Osmosis System
Pentair Reverse Osmosis System
Standard Reverse Osmosis System
The Everyday Benefits of Reverse Osmosis
Illi Water’s reverse osmosis systems for home improve your health, lifestyle, and overall quality of life. Our filter systems are easy on your pocket, give you 24/7 access to fresh water, make your food and beverages taste amazing, and remove water contaminants to keep you safe.
- Improve Taste and Odour: Reverse osmosis effectively removes impurities such as sulphur and chlorine from your water, improving its taste and odour. Every sip of water, cup of coffee, and meal will always taste amazing.
- Unlimited Filtered Drinking Water at Home: RO systems ensure an endless supply of clear, clean water from your tap. You don’t have to worry about running to the store to get water again.
- Saves Money by Replacing Bottled Water: You won’t need to buy bottled water if you have an RO system at home. Save money, reduce your carbon footprint, and keep the environment green and fresh.
- RO Removes 99% of Contaminants: RO filters remove up to 99% of hazardous contaminants, including lead, nitrates, and other pollutants. Whether you use water for drinking, washing, or cooking, it will always be safe.
How Does Reverse Osmosis Work?
Reverse osmosis (RO) is one of the most effective water purification methods available. It works by forcing water through an ultra-fine semi-permeable membrane under pressure, leaving dissolved salts, bacteria, chemicals, and heavy metals behind — delivering exceptionally clean, safe drinking water straight from your tap.
Here’s a step-by-step breakdown of the process.
1. Pre-filtration
Before water ever reaches the RO membrane, it passes through sediment and carbon block filters. These remove larger particles like rust, dirt, chlorine, and organic compounds, protecting the delicate membrane from damage and extending its lifespan.
2. Applying Pressure
Water is then pressurized, typically by a pump, to overcome its natural osmotic pressure. This is what makes the process "reverse" osmosis: rather than water naturally flowing toward a higher concentration, pressure forces it in the opposite direction, toward greater purity.
3. The RO Membrane
This is the heart of the system. Pressurized water is pushed through a semi-permeable membrane with microscopic pores so fine that only water molecules can pass. Up to 99% of contaminants, including dissolved salts, heavy metals, bacteria, viruses, and chemicals, are blocked and left behind.
4. Separation & Drainage
The RO process creates two separate streams: permeate and concentrate. Permeate comprises purified water cleaned by the membrane, whereas the concentrate contains the rejected water, which contains the contaminants.
5. Post-Treatment & Storage
Many RO systems include a final polishing carbon filter, which removes any residual taste or odour and gives the water a clean, crisp finish. The purified water is then stored in a pressurized tank, so clean drinking water is available on demand, 24/7, without any waiting.
Certified Water Filters With Reverse Osmosis
Illi Water’s systems carry certifications to the highest global regulatory standards, guaranteeing optimal performance to surpass your expectations.
NSF/ANSI Certified
Our filters are NSF/ANSI certified, which confirms they remove toxic impurities, providing you with safe, pure water.
WQA Certified
All our filters are certified by Water Quality Association Gold Seal, which validates that our systems adhere to strict protocols for contaminant reduction, structural integrity, and material safety.
What contaminants does our RO systems Remove
Our reverse osmosis systems are built to handle the contaminants most commonly found in home water supplies so you get water that's clean, safe, and actually tastes good.
- Heavy Metals (e.g., Lead, Mercury, Arsenic): Old pipes can leach toxic metals into your water without any visible sign. Over time, exposure to heavy metals like lead and arsenic has been linked to serious health issues, including kidney and liver damage. Our system blocks these before they ever reach your tap.
- Chemicals (e.g., Chlorine, Fluoride, Nitrates): Most tap water is treated with chlorine which does its job, but leaves behind a noticeable taste and smell. Nitrates and excess fluoride are also common. Our systems filter these out, making a real difference to how your water tastes and smells day to day.
- Organic Compounds (e.g., Pesticides, Herbicides, Pharmaceuticals): Pesticides, herbicides, and other organic compounds often creep into water supplies, which can cause severe health problems, including brain and heart issues. Our filters remove these synthetic contaminants to protect your health and improve your lifespan.
- Microorganisms (e.g., Bacteria, Viruses, Cysts): Microorganisms can be present in even municipal water. Our systems have a fine semi-permeable membrane that removes these pathogens, giving you hygienic water
With multiple filtration stages working together, our systems make sure what comes out of your tap is consistently clean not just most of the time, but every time.
Why Choose Illi Water RO System For Your Canadian Home?
Illi Water is backed by Watermart a Canadian water filtration company with over 30 years of experience in the industry. That means when you buy an Illi Water RO system, you're getting decades of expertise built into every unit.
Our systems are WQA and NSF/ANSI certified, so the performance claims aren't just marketing they're independently verified. And because we stand behind what we sell, every system comes with a 5-year warranty and a 90-day satisfaction guarantee. If it's not right for your home, we'll make it right.
Clean, reliable water for your family that's what we're here for.
FAQs
What's the difference between the Standard, Pentair, and Tankless reverse osmosis systems?
What's the difference between the Standard, Pentair, and Tankless reverse osmosis systems?
The main differences come down to filtration stages, flow rate, and features. The Standard RO System is the most budget-friendly option at $379.99, with 5–7 customizable stages and a storage tank. The Pentair RO System at $729.99 adds NSF/ANSI triple certification, a 41% water recovery rate, and tool-free cartridge changes. The Tankless RO System at $1,299.99 is the premium choice, with no storage tank, 800 GPD flow rate, alkaline remineralization, and a smart digital faucet that shows your water's TDS in real time.
Do all your reverse osmosis systems remove PFAS, lead, and microplastics?
Do all your reverse osmosis systems remove PFAS, lead, and microplastics?
Yes, all three reverse osmosis systems remove up to 99% of common contaminants, including PFAS, lead, chlorine, and microplastics. Each system uses a semi-permeable RO membrane that filters on a near-molecular level, stopping dissolved solids that basic filters simply can't catch. The Tankless model also adds UV sterilization to reduce bacteria and viruses by 99.9%.
Are these reverse osmosis systems hard to install under the sink?
Are these reverse osmosis systems hard to install under the sink?
None of them requires a plumber. All three systems are designed for DIY under-sink installation with push-fit connections, pre-installed filter cartridges, and step-by-step instructions included in the box. The Tankless model can be set up in around 30 minutes; the Standard and Pentair models are similarly straightforward to set up. If you'd prefer professional help, illi Water can connect you with certified installers across Canada.
How much does it cost to maintain a reverse osmosis system each year?
How much does it cost to maintain a reverse osmosis system each year?
Annual maintenance typically runs between $100 and $200 CAD, covering pre-filter and post-filter replacements every 6–12 months and an RO membrane replacement every 2–3 years. All three systems use easy-access, tool-free cartridges to keep servicing quick and mess-free. That's significantly less than the $600–$900 most Canadian households spend on bottled water each year.
What's your return policy if the system doesn't work for my home?
What's your return policy if the system doesn't work for my home?
Every reverse osmosis system comes with a 90-day satisfaction guarantee if you're not happy with it for any reason. Return it within 90 days for a full refund. All systems are also covered by a 5-year warranty against defects in materials and workmanship. Shipping is free across Canada on every order, and refunds are processed within 5–10 business days of inspection.
Which reverse osmosis system is best for a small apartment or condo?
Which reverse osmosis system is best for a small apartment or condo?
Any of our under-sink RO systems will work in a small kitchen; all three are compact and designed to tuck neatly inside a standard cabinet. If the space under the sink is especially tight, the Tankless RO System is the best fit, as it eliminates the storage tank entirely, freeing up roughly 4 square feet of cabinet space.

