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Submit Online Assessment
Share your symptoms, goals, and home setup so Water Doctor can narrow the right treatment path.
Residential water planning
The Right Water Solution for Your Home
Compare the main treatment paths for Ontario homes and move into the right next step without guessing between softeners, RO, UV, or maintenance.
Assessment-first if fit is still unclearShop directly when the category is already knownLong-term maintenance and replacement support
Start with an assessment when you still need help with sizing, installation, or fit. If you are still sorting out which product family is right, use Help Me Choose before you drop into a collection.
Best use of this page
Narrow the category, then choose whether to assess or shop.
Typical paths
- Softener for hard water
- RO for drinking-water quality
- UV for bacteria-risk cases
Choose your home water path
Start with the water problem, not the product SKU.
This selector should help visitors narrow the category before they decide whether to assess, compare, or shop.
Drinking Water
Pure and fresh drinking water
Remove chlorine, heavy metals, and unwanted taste so the drinking-water decision is clear before you compare products.
Best for taste, contaminants, and under-sink filtration decisions.
Shop RO SystemsProduct-Ready Path
Compare drinking-water systems with a clearer buying context.
These cards are for visitors who already know they want better drinking water. If the category is still unclear, move back into assessment before checkout.
Shop directly
Best when you already know you want a drinking-water system and need to compare SKUs, price, and format.
Assess first
Use the assessment if you still need help choosing between under-sink, tankless, or whole-home treatment.
800 GPDSave 16%
Drinking-water systemIn stock
Water Doctor GF3 800GPD RO System
- 800 GPD / 0.8 GPM
- Multi-layer filtration
- No power needed
$799.99$949.99
View details
5-Stage
Drinking-water systemIn stock
Water Doctor 5-Stage Undersink RO System
- 5-stage reverse osmosis
- NSF certified
- Energy-free operation
$570
View details
1000 GPD
Drinking-water systemIn stock
Water Doctor COMO-R1000 Tankless RO System
- 1000 GPD / 3.2 L/min
- Smart faucet with TDS
- Automatic flush + WiFi
$1,499.99
View details
4-StageSave 11%
Drinking-water systemIn stock
Water Doctor 4-Stage Undersink RO System
- 4-stage reverse osmosis
- Storage tank included
- Faucet included
$799.99$899.99
View details
Tankless
Drinking-water systemIn stock
Water Doctor COMO-R700 Tankless RO System
- 1.84 L/min output
- Tankless design
$1,199.99
View details
Side-by-Side
Compare RO Systems
This matrix uses only details that are clearly published on the current Shopify product pages. Blank cells mean the product page does not currently state that point clearly enough to compare.
| Feature | GF3 800GPD $799.99$949.99 Save 16% | 5-Stage RO $570 | COMO-R1000 $1,499.99 | 4-Stage RO $799.99$899.99 Save 11% | COMO-R700 $1,199.99 |
|---|---|---|---|---|---|
| Format | RO system | Under-sink RO | Tankless RO | Under-sink RO | Tankless RO |
| Published output | 800 GPD / 0.8 GPM | 1000 GPD / 3.2 L/min | 1.84 L/min | ||
| Filtration setup | Multi-layer filtration | 5-stage reverse osmosis | Tankless reverse osmosis | 4-stage reverse osmosis | Tankless reverse osmosis |
| Product-page highlights | No power needed | NSF certifiedLeak-proof designEnergy-free operation | Smart faucet with TDSAutomatic flushWiFi app control | Complete setStorage tank includedFaucet included | 1.84 L pure water in 1 min |
| Shop This System | Shop This System | Shop This System | Shop This System | Shop This System |
Tap to compare up to 3 products. Blank cells mean that detail is not clearly published on the current Shopify product page.
GF3 800GPD
$799.99
$949.99
5-Stage RO
$570
Format
RO system
Under-sink RO
Published output
800 GPD / 0.8 GPM
Filtration setup
Multi-layer filtration
5-stage reverse osmosis
Product-page highlights
No power needed
NSF certifiedLeak-proof designEnergy-free operation
Not sure which one is right for you?
Get a Free AssessmentProcess and handoff
How Water Doctor moves you from diagnosis to long-term support.
This should feel like a guided buying process, not a leap from content into checkout. Each step reduces uncertainty before the next one.
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Get Expert Consultation
Talk through fit, maintenance, and installation expectations before you commit to the wrong system.
3
Choose the Right System
Move into shopping only after the category is clear and the product path makes sense for your home.
4
Schedule Installation
Our technicians confirm timing, complete installation, and make sure the system is operating correctly.
5
Maintain and Reorder
Replacement filters, maintenance, and long-term support keep the system performing after install.
Next action
Ready to move to the next step?
Start with a quick assessment or open live chat to verify product fit before checkout.
Assessment takes 2 to 3 minutes. Live chat opens in Shopify Inbox.
Choose by water issue
Jump to the right collection by function, not by guesswork.
Use these cards when the water problem is already clear and you want the fastest clean handoff into the right store collection.
Water Softener
Water Softener
Use this path for scale, dry skin, cloudy dishes, and hard-water appliance wear.
Shop Water SoftenersRO Systems
RO Systems
Use this path for taste, contaminants, and cleaner drinking water from the kitchen tap.
Shop RO SystemsUV Disinfection
UV Disinfection
Use UV protection for well water and microorganism risk management without adding chemicals.
Shop UV SystemsWhole-Home Filtration
Whole-Home Filtration
Use this path when chlorine, sediment, or broad home-wide treatment is the main concern.
Shop Whole-Home SolutionsReplacements
Replacements
Use this path when the system is already installed and you only need filters, lamps, or service parts.
Shop Replacement FiltersNeed guidance first?
Not sure which function actually fits your home?
Get a personalized recommendation based on your water quality, home setup, and goals before you move into shopping.
Our Most Trusted Solutions
Chosen by thousands of households for proven performance.
Testimonials
What Our Customers Say
Hear from our satisfied customers about their experience with Water Doctor
"The Water Doctor team did an amazing job installing our whole house water filtration system. The water quality is noticeably better, and their service was professional from start to finish."
Michael Thompson
Verified Customer
"Excellent service! They helped us choose the perfect under-sink filter for our kitchen. Installation was quick and clean. The team was knowledgeable and friendly."
Sarah Williams
Verified Customer
"We've noticed a significant improvement in our water quality since installing the Water Doctor filtration system. Their maintenance service is also top-notch."
David Chen
Verified Customer
"Water Doctor installed a water filter system for my home yesterday. The two technicians came at the time promised, they are very profession, and work very efficiently. The total installation time is about 15 minutes. They gave the after-care instructions as well. I would definitely recommend Water Doctor to anyone who might needs the service."
Kelly Li
Verified Customer
"Installing a water softener from Water Doctor was the best decision for our home. Our dishes are spotless, appliances last longer, and our skin feels so much better after showering. The technicians explained everything clearly and set up the system perfectly."
Robert Johnson
Verified Customer
"The comprehensive water treatment solution from Water Doctor transformed our home water quality. They installed a combined system addressing hardness, chlorine, and sediment. Their expert advice helped us choose the right solution for our specific water problems."
Amanda Garcia
Verified Customer
"I was impressed with the installation service from Water Doctor. The team arrived on time, worked efficiently, and left no mess behind. They took the time to walk me through how to operate and maintain the system, and even followed up a week later to ensure everything was working properly."
Jason Miller
Verified Customer
Common Questions
Residential Water Treatment FAQ
Get answers to frequently asked questions about residential water treatment systems and services.
Find Water Treatment Service Near You
Browse GTA city pages for local water hardness, service coverage, and recommended systems.
Explore More Services
Related Water Treatment Solutions
Discover other water treatment services that may benefit your home or business.
Assessment Path
Get Your Free Residential Water Assessment
Tell us about your water needs and get a personalized recommendation for the perfect water treatment solution for your home.
Ontario Homeowners
Need help choosing the right home water system?
Tell us about your water and we will point you to the right softener, RO, UV, or whole-home setup from our Markham team.
Contact Methods
Phone
+1 289-748-9666Showroom Location
601 Denison St, Markham, ON L3R 1B8
Business Hours
10:00 AM - 5:00 PM
Quick Actions
Use chat for a fast question, or choose the action that matches where you are in the decision process.