Countertop reverse osmosis that attaches to your kitchen faucet in under 60 seconds — no plumber, no tools, no permanent install.
4-Stage Basic Countertop Reverse Osmosis
This 4-Stage Basic Reverse Osmosis System connects directly to your kitchen faucet and requires no plumber, no permanent installation, and no tools. It’s an ideal portable water purification solution for apartments, homes, RVs, aquariums, and travel — assembled in-house in California and sold under the MyWaterClub brand.
Reverse osmosis pushes your tap water through a semi-permeable membrane that filters by size exclusion, reducing dissolved solids down to roughly 0.0005 microns. The result is clean, great-tasting drinking water at a fraction of the cost of bottled — about 5–6¢ per gallon.
The 4 filtration stages
Stage 1 — Sediment
5 Micron Sediment Filter
Reduces dust, sand, rust, and suspended particles — protecting downstream filters and extending membrane life.
Stage 2 — Carbon
Coconut Shell Carbon (T28)
Reduces chlorine, taste and odor, VOCs, and many common organic chemicals before the water reaches the membrane.
Stage 3 — RO Membrane
TFC Reverse Osmosis Membrane
High-rejection membrane reduces 95–99% of TDS and a wide range of dissolved contaminants including arsenic, fluoride, lead, and chromium.
Stage 4 — Polish
Post-Carbon Polishing Filter (T33)
Final carbon stage polishes taste and delivers crisp, finished drinking water at the spout.
Choose your membrane: 100 or 150 GPD
100 GPD Membrane
Standard production rate with balanced efficiency.
150 GPD Membrane
Higher output for faster water production and increased daily demand.
Both membrane options deliver the same purification quality. Higher-GPD membranes produce water faster; actual performance depends on your water pressure and temperature.
Key features
- ✓Transforms tap water into clean, great-tasting drinking water
- ✓Installs in under 60 seconds — no plumbing work or permanent fixtures
- ✓Advanced 4-stage reverse osmosis filtration
- ✓Reduces a wide range of dissolved contaminants — chlorine, chloramines, VOCs, pesticides, and heavy metals
- ✓Reduces 95–99% of total dissolved solids (TDS)
- ✓Fluoride reduction: approximately 90–95%
- ✓Operating cost approximately $0.05–$0.06 per gallon
- ✓Designed and assembled in the USA (California)
- ✓30-day satisfaction guarantee
About bacteria & microorganisms
Because reverse osmosis filters by size exclusion at the membrane, it also reduces many particles down into the size range of bacteria and cysts. Important: this system is not a certified microbiological purifier. Do not use it to make water that isn’t already microbiologically safe safe to drink — if you’re on an untested well or under a boil-water advisory, treat your water accordingly first.
Specifications
| System type |
Countertop / faucet-connect reverse osmosis |
| Stages |
4 (Sediment · T28 Carbon · RO Membrane · T33 Post-Carbon) |
| Membrane options |
100 GPD or 150 GPD (TFC) |
| TDS reduction |
95–99% |
| Filtration accuracy |
~0.0005 microns (membrane) |
| Water production |
~3–5 gallons per hour (drip-style) |
| Service life |
Filters ~12 months (varies with water quality & usage) |
| Operating cost |
~$0.05–$0.06 per gallon |
| Product dimensions |
14 × 6 × 6 in |
| Weight |
~5.5 lbs |
| Assembly |
Assembled in the USA (California) |
| Brand |
MyWaterClub |
| SKU |
CRO-4T |
What to expect day to day
- RO is a slow, drip-style process — not a continuous high-flow tap. It produces roughly 1 gallon every 11–24 minutes depending on membrane size, pressure, and temperature.
- Water production runs about 3–5 gallons per hour. We recommend collecting purified water in advance so you always have a steady supply on hand.
- Example TDS result: if your source water is around 350 ppm, filtered water may measure roughly 15–50 ppm after 5–7 days of regular use following the initial flush.
Typical RO membrane rejection rates
| Contaminant |
Typical % reduced |
Contaminant |
Typical % reduced |
| Arsenic |
93–96% |
Lead |
95–98% |
| Aluminum |
86–90% |
Phosphate |
94–98% |
| Bicarbonate |
90% |
Magnesium |
94–98% |
| Cyanide |
85–93% |
Fluoride |
90–95% |
| Chloride |
85–92% |
Nickel |
96–98% |
| Calcium |
94–98% |
Cadmium |
94–98% |
| Sodium |
86.5–93% |
Detergent |
97–99% |
| Sulfate |
96–98% |
Herbicides |
97–98% |
| Potassium |
84–95% |
Insecticides |
97–98% |
| Barium |
95–98% |
Strontium |
96% |
| Iron |
94–98% |
Mercury |
94–98% |
| Zinc |
95–98% |
Selenium |
94–96% |
| Nitrate |
60–76% |
|
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Rejection rates are typical ranges for RO membranes and vary with water chemistry, pressure, temperature, and membrane condition.
Connection options
Connect the system with the included kitchen-faucet adapter, or choose the adapter that matches your setup:
- Kitchen faucet adapter (standard, included)
- Pull-down or spray kitchen faucet adapter
- Bathroom faucet adapter (male or female)
- Garden or laundry hose connection (indoor or outdoor)
- Shower arm adapter
- Handheld shower adapter
Routine filter replacement
To keep your system delivering consistent water quality, replace filters as part of normal maintenance:
Actual filter life varies with water quality, usage, and incoming TDS levels.
Recommended accessory
Inline Mechanical Shut-Off Timer
Highly recommended with any countertop RO system. It automatically stops the water after a preset time — fill containers without worrying about overflows. Prevents spills, perfect for unattended or overnight filling, and needs no electricity or batteries.
View Inline Shut-Off Timer →
Please note: Reduction performance and filter life depend on your water chemistry, pressure, and usage, so results vary from home to home. This product is not certified to treat water of unknown quality and is not a substitute for testing your water. Descriptions use general, qualified language and are not health claims. When in doubt, test your water or ask us and we’ll help you choose the right system.
Max –
I previously had a standard filtered water unit, but even after replacing the filter, the water never tasted truly clean or refreshing. I was determined to find a better solution and knew that reverse osmosis is one of the most effective technologies for removing impurities from water, so I decided to give this system a try. Installation wasn’t the simplest and does require some time and preparation. I recommend doing a bit of research beforehand and allowing yourself enough time, or even having a handyman help if needed. However, once the system was properly installed, flushed, and running, the difference was immediately noticeable.
The water quality is on a completely different level. You can taste the improvement right away, and it even makes difference when cooking—simple things like pasta—and when watering plants. Everything about the water feels cleaner and fresher. This system truly delivers, and it’s the real deal
Fred K –
It’s easy to set up and the water taste fine but the size of the filter is significantly smaller than other brand I have used. Also the water is still grey in color (loose carbon particles in filter)after using it for couple of days. So I added another filter to filter out the carbon to make the water drinkable. It’s fine for now as a back up water filter but I doubt it’s good enough for long term use.