How waterdrop® Achieved a 19.3x ROI with Two WhatsApp Campaigns in 24 Hours

Written by: Johannes Mansbart CEO & Co-Founder, chatarmin.com

19,34x

Return on WhatsApp Spend

78,8%

Open Rate

4,61%

Click Rate

500+ Brands that actually get read.

Holy logo
Marc O'Polo logo
Vossen logo
Metro logo
Ahead logo
Biogena logo
Bauhaus logo
waterdrop logo
Why chatarmin?

The waterdrop® Story

waterdrop® is the world's first microdrink manufacturer. The Vienna-based company sells sugar-free drink cubes in over 30 countries, operates more than 40 of its own stores, and employs around 400 people. In retail, you'll find waterdrop® at Rossmann, REWE, Edeka, and Müller. The D2C business via the brand's own online store is strong. But in CRM, a channel that truly performs was missing. Email delivers reach but lands more and more often in the promotions tab. Open rates are falling. The direct line to the customer is missing. waterdrop® wanted a channel where campaigns land and drive revenue. The choice fell on WhatsApp.

Customer Experience

How was the campaign structured?

waterdrop® had a clear goal in March: run two sales campaigns within 24 hours via WhatsApp. High reach, high conversion, low cost per message.

Campaign 1

Campaign 1 went out in the morning to 18,833 WhatsApp subscribers. High-converting message with direct link to the store and a clear call to action. This message opened the 24-hour conversation window at Meta for each recipient.

waterdrop iPhone Mockup Campaign 1

Campaign 2

Campaign 2 followed the same day. Second offer, same recipients. Because the conversation window was already open, no additional Meta costs applied to the second message.

waterdrop iPhone Mockup Campaign 2

The cost per WhatsApp recipient was cut in half. Two campaigns for the price of one.

Book a Demo

Technical Setup

Seamless Integration into the Tech Stack

waterdrop® connected Chatarmin as a WhatsApp marketing channel to its existing tech stack. Campaigns can be planned, segmented, and sent directly via the Chatarmin dashboard. The team retains full control over timing, content, and recipients.

Seamless Integration into the Tech Stack

Automated Flows

Via the Chatarmin Flow Builder, automated WhatsApp journeys can be set up. Typical flows for brands like waterdrop®: → Abandoned cart: Reminder 1–3 hours after abandonment → Post-purchase: Thank-you message with cross-sell recommendation → Back-in-stock: Automatic notification when products become available → Welcome flow: First contact point after opt-in with voucher

Automated Flows

The Results

Two campaigns in 24 hours. The figures from the Chatarmin dashboard.

Return on WhatsApp Spend

Return on WhatsApp Spend

Every euro invested brings back €19.34 in revenue. waterdrop® runs two campaigns within a single conversation window and halves the cost per recipient as a result.

Open Rate

Open Rate

4 in 5 recipients open the message. Email campaigns in e-commerce average a 20% open rate. WhatsApp delivers nearly four times that.

Unsubscribe Rate

Unsubscribe Rate

25 out of 18,833 recipients unsubscribed. Two campaigns on the same day, and subscribers stay. That shows: the content hits the target audience.

Book a Demo

The WhatsApp Strategy

Smart Campaign Timing

Smart Campaign Timing

waterdrop® deliberately sent both campaigns within a 24-hour window. This way, the WhatsApp conversation window is only charged once. Cost per recipient is cut in half without losing any reach.

Product-Focused Campaigns

Product-Focused Campaigns

Each message had one clear goal: revenue. Direct link to the store, concrete offer, one call to action. The 3.45% conversion rate shows that recipients immediately understood what it was about.

Relevant Content Instead of Mass Communication

Relevant Content Instead of Mass Communication

18,833 recipients, 0.13% unsubscribe rate. That means the content was relevant to the target audience. waterdrop® only sends campaigns that match the purchase behavior of its subscribers. Sending irrelevant messages too often means losing subscribers.

Multimedia Brand Communication

Multimedia Brand Communication

Chatarmin enables the sending of images, videos, and carousels directly in the WhatsApp message. waterdrop® prepared the campaigns visually. This drives higher attention and more clicks than plain text messages.

Live in just a few weeks

From setup to first conversion. Here's how you launch with Chatarmin.

1

Phase 1

Onboarding & Integration

CRM & Shop connected

2

Phase 2

First Flows live

Collect leads from day 1

3

Phase 3

First Campaign live

Newsletter to your audience

4

Phase 4

Automation is running

Flows, AI & Campaigns active

Ongoing

Optimize & Scale

New Flows, A/B Tests, Growth

Book a Demo

Your Unfair Advantage Over Email

Team Relief Through Automation

Team Relief Through Automation

Flows handle the routine. Abandoned cart, post-purchase, and back-in-stock run automatically. The team has headspace for strategy and creative campaigns.

Extra Revenue Channel

Extra Revenue Channel

WhatsApp is more than a service channel. With Chatarmin, it becomes a revenue driver. Campaigns, product launches, and offers land directly on the lock screen of your customers. 78.8% open rate vs. 20% in email.

Direct Line to the Customer

Direct Line to the Customer

Customers reply, ask questions, interact. WhatsApp is a personal channel. That creates closeness no newsletter can match. And the 0.13% unsubscribe rate shows: recipients want to be reached there.

How Our Tool Helps You Executing

All the features you need for WhatsApp Marketing and WhatsApp Support in one tool. No UX from hell — just simple and effective.

WhatsApp Newsletter

WhatsApp Newsletter

Send high-converting newsletter campaigns to your audience. Benefit from 85% open rates.

Read more →
WhatsApp Flows

WhatsApp Flows

Automate the user journey of your customers with triggers, conditions, and logic.

Read more →
WhatsApp Chat Inbox

WhatsApp Chat Inbox

Reply to your customers via WhatsApp. All the important things in one inbox.

Read more →
WhatsApp AI Chatbot

WhatsApp AI Chatbot

AI chatbot for automatic responses to recurring inquiries.

Read more →
WhatsApp Analytics

WhatsApp Analytics

Track your marketing campaigns and view their performance in real time.

Read more →

All case studies

Read More →
How Trendt Vision drove €358,100 in WhatsApp revenue on Black Friday at a 258.6x ROI

How Trendt Vision drove €358,100 in WhatsApp revenue on Black Friday at a 258.6x ROI

How snushero generated over €452,000 in revenue via WhatsApp in 5 months

How snushero generated over €452,000 in revenue via WhatsApp in 5 months

How bedrop generated €163,983 in WhatsApp revenue in 4 days and won the Chatarmin Revenue Award

How bedrop generated €163,983 in WhatsApp revenue in 4 days and won the Chatarmin Revenue Award

Scale Your Brand with WhatsApp Marketing

Over 450 e-commerce brands use Chatarmin. With WhatsApp Marketing, you increase your revenue and reach your target audience where they really are.

Book a Demo
Book a Demo