Waterdrop M6SL Countertop Mineral Reverse Osmosis System
- Reverse osmosis, countertop, installation-free
- 8-stage filtration, **3:1 pure to drain**
- NSF/ANSI 58 and **NSF/ANSI/CAN 372** certified
- 185 oz tank: 135 oz tap water, 50 oz wastewater
- Up to 300 ppm supply TDS, **12 month** filter life
- 15.9 x 9.3 x 14.5 in, corded electric
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A countertop reverse osmosis unit with a glass pitcher and no plumbing install, certified to two standards. The supply TDS ceiling is low, so test your water first.
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ASIN: B0GRZF389RModel: WD-M6SLCategory: Water Filtration Systems
Overview
Not an under-sink system, the WD-M6SL is a corded countertop reverse osmosis unit that fills from a tank you pour into and dispenses into a glass pitcher. A reverse osmosis membrane, carbon block and PP cotton make up the filter path, and one filter is pre-installed.
Reverse osmosis without cabinet work makes it a fit for rentals, and PFAS and TDS reduction are listed alongside two certifications. The supply TDS ceiling is modest, the tank has to be refilled by hand, and the unit needs counter space and an outlet.
Who it's for
A renter, student or small household that wants reverse osmosis on the counter, with an outlet nearby, gets the intended use. Homes with very hard water, or buyers wanting automatic mains feed, should choose another approach.
Pros and cons
- No plumbing installation needed
- Two certifications listed
- PFAS and TDS reduction listed
- Glass pitcher included
- Supply TDS ceiling is low
- Tank needs manual refilling
- Needs counter space and an outlet
Performance notes
A reverse osmosis membrane rejects dissolved solids from water placed in the tank, and the stated ratio shows how much goes to the wastewater tank for each part kept. With a tank split between tap water and wastewater, the wastewater side fills as the unit runs and has to be emptied.
Specifications
| Brand | Waterdrop |
|---|---|
| Model | WD-M6SL |
| Dimensions & fit | |
| Dimensions | 15.9 x 9.3 x 14.5 in |
| Item Dimensions L X W X H | 15.9"L x 9.3"W x 14.5"H |
| Capacity & performance | |
| Capacity | 4 literslower than 87% of 46 water filtration systems |
| Filter Life Cycle | 12 months |
| Power & efficiency | |
| Power Source | Corded electric |
| Construction & materials | |
| Material Type | Reverse osmosis membrane, carbon block, PP cotton |
| Compatibility & installation | |
| Installation Type | Countertop, installation-free |
| Included components | |
| Included Components | M6SL RO system with 1 pre-installed filter, user manual |
| Unit Count | 1 Count |
| Warranty & support | |
| Supported Water Tds Level Maximum Ppm | 300 ppm |
| Other details | |
| Purification Method | Reverse osmosis, 8 stage |
| Container Type | 185 oz total, 135 oz tap water and 50 oz wastewater |
| External Testing Certification | NSF/ANSI 58 and NSF/ANSI/CAN 372 |
Closest rivals on specs
iSpring UVF11A Water Filtration System- Capacity 1.1 vs 1 gallons (+10%)
Apec Water ROCT-C1 Water Filtration System- Capacity 1.1 vs 1.3 gallons (-15%)
Berkey BER-TU2+BER-PF2 Water Filtration System- Capacity 1.1 vs 1.5 gallons (-27%)
Frequently asked questions
What is in the Waterdrop WD-M6SL box?
The M6SL RO system with 1 pre-installed filter and a user manual. The glass pitcher is part of the listed product, but the included components do not name it separately.
Does the Waterdrop WD-M6SL need plumbing?
No. It is listed as countertop and installation-free, and it runs from a power cord.
What water can the WD-M6SL treat?
The listing gives a supply TDS maximum of 300 ppm, so water above that is outside the stated range.
Is the WD-M6SL an under-sink system?
No. It is a countertop unit.