A countertop RO system gives you reverse osmosis water with no drilling, no plumbing and nothing under the sink. That makes it the answer for renters and anyone who doesn't want to touch the water line.
- Our pickAquaTru Classic$475 list
AquaTru Classic

- Price
- $475 list
- Type
- 0.75 gal clean tank
- Gallons per day
- Batch
- Pure to drain
- 4:1 (claimed)
- Certified to
- NSF/ANSI 42, 53, 58, 401
- Power
- Needs an outlet
The AquaTru Classic is the countertop system we'd buy. You fill the tap-water tank, it runs the water through four stages, and clean water collects in a 0.75-gallon tank you can lift out and put in the fridge. It's certified to NSF/ANSI 42, 53, 58 and 401, and AquaTru claims a 4:1 ratio, far less waste than most under-sink systems.
It costs $475 list. It uses counter space and makes water in batches, so a large family may find themselves refilling it often.
What we like
- No installation
- Certified to NSF/ANSI 42, 53, 58 and 401
- Low waste (4:1 claimed)
What to know
- 0.75-gallon clean tank
- Uses counter space
- Needs an outlet
Countertop or under-sink?
| Countertop (AquaTru) | Under-sink (G3P800) | |
|---|---|---|
| Install | None | Under the sink, drill for faucet |
| Capacity | Batches, 0.75 gal clean tank | 800 GPD on demand |
| Best for | Renters, one or two people | Owners, families |
| Price | $475 list | $999 list |
Compare them in detail in Waterdrop G3P800 vs AquaTru.
Questions
Can I fill an ice maker from a countertop RO system?
Yes. Pour from the clean-water tank into the ice maker's reservoir.

