Waterdrop WD-C1S Water Filtration System
- Capacity: 1.1 gallons
- Purification Method: Reverse Osmosis
- Installation Type: Countertop
- Supported Water Tds Level Maximum Ppm: 500
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A countertop reverse osmosis unit for households wanting stronger filtration than a pitcher without a permanent under-sink install.
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ASIN: B0CM9HRBG8Model: WD-C1SCategory: Water Filtration Systems
Overview
The Waterdrop WD-C1S is a countertop reverse osmosis system with a 1.1 gallon capacity, built to sit directly on the counter without permanent plumbing.
At 14 lb and roughly 12 x 14 in, it is sized to work as a self-contained countertop unit rather than an under-sink install. Its 4.0 rating trails others in this filtration lineup, worth weighing alongside the specs.
- Reverse osmosis purification
- 1.1 gallon capacity
- Countertop install, no plumbing
- 14 lb, 8.3 x 11.7 x 13.7 in
Who it's for
Households wanting reverse osmosis filtration without a permanent under-sink installation. Not for those who would rather plumb in a fixed RO system.
Pros and cons
- Reverse osmosis filtration in a self-contained countertop unit
- No permanent plumbing required
- 1.1 gallon capacity limits reserve for big households
- 14 lb unit takes up meaningful counter space
Performance notes
Reverse osmosis forces water through a semi-permeable membrane, filtering out dissolved solids a carbon filter alone would miss. The 1.1 gallon capacity sets how much filtered water is available before it needs refilling.
Specifications
| Brand | Waterdrop |
|---|---|
| Model | WD-C1S |
| Dimensions & fit | |
| Weight | 14 poundshigher than 53% of 41 water filtration systems |
| Item Dimensions L X W X H | 8.3 × 11.7 × 13.7 inches |
| Capacity & performance | |
| Capacity | 1.1 gallonslower than 87% of 46 water filtration systems |
| Upper Temperature Rating | 100 °F |
| Filter Life Cycle | 12 months |
| Lowertemperature Range | 41 °F |
| Power & efficiency | |
| Power Source | Corded Electric |
| Construction & materials | |
| Material Type | Reverse Osmosis Membrane & Carbon Block & PP Cotton |
| Compatibility & installation | |
| Installation Type | Countertop |
| Included components | |
| Unit Count | 1 |
| Included Components | C1S RO System, Replacement Filters, User Manual |
| Warranty & support | |
| Supported Water Tds Level Maximum Ppm | 500 |
| Other details | |
| Purification Method | Reverse Osmosis |
| Container Type | Dispenser |
| Number Of Items | 1 |
| Other Special Features Of The Product | 6 Stage RO Filtration |
| Part Number | WD-C1 |
| Item Highlight | Portable Reverse Osmosis Water Filter, Reduce PFAS, No Installation Required, BPA Free |
Closest rivals on specs
Bluevua RO100ROPOT-Lite UV Water Filtration System- Capacity 1.1 vs 0.3 gallons (+267%)
Berkey BER-CU2+BER-PF2 Water Filtration System- Capacity 1.1 vs 6 gallons (-82%)
- Weight 14 vs 12 pounds (+17%)
Berkey BER-TU2+BER-PF2 Water Filtration System- Capacity 1.1 vs 1.5 gallons (-27%)
- Weight 14 vs 6.97 pounds (+101%)
Frequently asked questions
Does the Waterdrop WD-C1S need to be plumbed in?
No, it is a countertop unit that does not require permanent plumbing.
How much filtered water does the WD-C1S hold?
It has a 1.1 gallon capacity.