Drinking Water Systems
5-Stage Tank Reverse Osmosis
The classic under-sink RO. Proven, simple, affordable.
A traditional reverse osmosis system with a storage tank. Five stages of filtration, a dedicated drinking-water faucet, and decades of track record behind the design. If you want clean drinking water without the tankless price, this is it.
Best for: Households wanting proven RO at a lower price
What you get
Features
- 5-stage reverse osmosis filtration
- 100 GPD membrane with pressurized storage tank
- Dedicated drinking-water faucet
- Removes dissolved solids, chlorine and heavy metals
- Simple, widely available replacement filters
- Free installation
Full specifications
Key specifications
| Type | Tank, under-sink |
|---|---|
| Filtration stages | 5 |
| Production | 100 GPD, stored in tank and poured on demand |
| Faucet | Dedicated, five finishes |
| Cabinet space | Storage tank under the sink |
| Filter changes | Changed by our team |
| Fittings | Quick-connect |
| Pairs with | Any whole-home system, or on its own |
Installation, upkeep & warranty
| Installation | Included — dedicated faucet, drain saddle, cold-water tie-in |
|---|---|
| Location | Under the kitchen sink, or wherever the drinking tap goes |
| Upkeep | Filter changes by our team |
| RO system warranty | 1 year |
| Labor warranty | 1 year from date of purchase |
What reverse osmosis removes
- Arsenic
- Nitrate and nitrite
- Fluoride
- Lead and heavy metals
- Uranium and chromium-6
- Chlorine and disinfection byproducts
- Sediment and dissolved solids
- Mineral taste and odor
Warranty on this system
- 1 year
- The RO system
- 1 year
- Installation labor
- 5 years
- Media and filter stages
Specifications from the manufacturer’s documentation. Component brands and certifications are those of their respective manufacturers.
Watch
Reverse osmosis at the kitchen sink
What reverse osmosis removes that a whole-home system can't, and why it goes at the drinking tap. From the /lp/single-faucet-ro landing page.
More photos
A closer look
Colour matched
Pick a faucet that matches your kitchen
The drinking water faucet is the only part of this system you actually see, so it comes in five finishes. Tell us which at the water test.
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Reviews
From people who had one installed
“Good and reliable water filter system. Filter system installer Pete, he is very knowledgeable, experienced and very very cooperative person. He installed the filter system very professionally and nicely. I would recommend Pete to install the filter system.”
Farzan GillaniGoogle review · Jan 2026“The name says it all. HONEST. Great job by Pete on the clean, professional, and quick install. Highly recommended.”
Bernardo RochaGoogle review · Dec 2025“Honest Water Softener Installation did an excellent job—professional, efficient, and clearly knowledgeable. The whole process was smooth from start to finish.Special mention Ronald & Peter”
MadaiahGoogle review · Oct 2025Free water test
Find out what's actually in your water
We'll test your water at your kitchen sink, show you the result, and tell you what — if anything — you need. Free, and there's no system that fits every house.
- Free on-site water test
- Free installation
- Lifetime warranty