Waterdrop C1S WD-C1S Countertop Reverse Osmosis System

The Waterdrop C1S countertop reverse osmosis system (WD-C1S) is a plug-in purifier with a detachable pitcher, touchscreen TDS display and a six-stage filter claim. It is specified for room-temperature water only, and the listing says not to use well water or source water above 500 TDS.

At a glance

Countertop, plug-in operation is described as requiring no plumbing installation.
Detachable pitcher can be removed for pouring and cleaning.
Touchscreen is claimed to show TDS readings and filter-life reminders.
The listing claims reduction of up to 99% of several contaminants, including PFOA, PFOS, lead, chlorine, fluoride, arsenic and TDS. These are manufacturer claims, not independent verification.

Price

$379.22Save 24%

Reference price: ~~$499.00~~

Price checked: 12 Nov 2026

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Pros and cons

Pros

No plumbing connection is required according to the listing, which suits renters or users who do not want an under-sink installation.
The detachable pitcher and five dispensing-volume settings offer more flexible serving and storage than a fixed outlet alone.
A screen showing TDS and filter-life information may help users monitor readings and replacement timing.

Cons

The system only enhances room-temperature water, so it is not intended to dispense chilled or heated water.
The stated source-water limits exclude well water and water above 500 TDS, restricting suitable water sources.

Technical specifications

13 specifications

Identity
Brand	Waterdrop
Model	WD-C1S

Filtration and operation
Purification method	Reverse Osmosis
Claimed filtration stages	6-Stage RO Filtration
Power configuration	Corded Electric
Installation type	Countertop
Maximum supported source-water TDS	500
Pure-to-drain ratio	3:1 Pure to Drain Ratio

Dimensions and capacity
Dimensions listed	39.7L x 27.7W x 42.8H centimetres
Capacity	1.1 Gallons

Materials
Material listed	Plastic

Controls and filter
Volume dispensing options	5 adjustable water volume settings
Filter lifespan claim	up to 12 months

What to know before buying

The listing says to complete an initial rinse by emptying and refilling the tank when the indicator reaches 50%, then continue until the screen reaches 100%. It also says to remove the screen's black protective film before use.

What’s in the box

Included

Water filter

Who is it for?

A good fit for

Households wanting countertop reverse osmosis without plumbing work, using eligible source water.
Users who want a removable pitcher and touchscreen indicators for TDS and filter life.

Less suited to

Anyone needing hot or chilled water from the purifier.
Users relying on well water or source water with TDS above 500.

Waterdrop C1S WD-C1S Countertop Reverse Osmosis System · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 38 ratings

5 stars74%74%
4 stars8%8%
3 stars5%5%
2 stars5%5%
1 star8%8%

Customer feedback describes satisfaction with purification quality and performance, and mentions clean water, taste and a report of pure water after a short flush. Those comments are relevant to the system's room-temperature reverse-osmosis use, but they do not verify the listed contaminant-reduction claims. The aggregate rating is 4.3 out of 5 from 38 ratings. Ratings alone do not explain individual experiences.

Positive themes

Feedback mentions water quality and taste positively.
Customers report satisfaction with performance and say the system meets their needs.

Frequently asked questions

Does the Waterdrop C1S need plumbing installation?

The listing describes it as a countertop, plug-in system with no plumbing required.

Can it produce hot or cold water?

No. The listing states that the WD-C1S enhances room-temperature water only.

What source water is suitable?

The listing says not to use well water or source water with TDS above 500.

What does the initial rinse involve?

After powering on, the system auto-rinses. When the indicator shows 50%, empty and refill the tank, then continue rinsing until the screen reaches 100%.