Case Studies / waterdrop®

How waterdrop® Achieved a 19.3x ROI with WhatsApp Sales Campaigns

19,34x

Return on WhatsApp Spend

78.8%

Open Rate

4.61%

Click Rate

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Written by Johannes Mansbart

CEO & Co-Founder, chatarmin.com

Last updated at: September 30, 2025

FMCG

Challenge

waterdrop® is known for its innovative microdrinks and products around sustainable hydration.
In March, the company wanted to launch two sales campaigns within just 24 hours.

The challenge: Achieve high reach and conversion – while keeping costs as low as possible.
WhatsApp campaigns can quickly become expensive if the conversation window is not used efficiently.

Solution

With Chatarmin, waterdrop® implemented a smart campaign strategy that leveraged WhatsApp’s 24-hour conversation window to its fullest.

  • Timing: Two campaigns within a single day to maximize reach and engagement.
  • Efficiency: By bundling the messages strategically, WhatsApp costs were cut in half.
  • Content: Relevant, sales-focused messages with a clear call to action.

The result was a setup that was not only cost-efficient but also performance-driven.

Results

The campaign performance speaks for itself:

  • Return on WhatsApp Spend (ROWS): 19.34x
  • Open rate: 78.8%
  • Click rate: 4.61%
  • Conversion rate: 3.45%
  • Recipients: 18,833
  • Unsubscribe rate: 0.13%

Conclusion

The waterdrop® case demonstrates how WhatsApp campaigns can be run efficiently and profitably.

By strategically using the conversation window, the company was able to halve costs while achieving an open rate of nearly 80%.

The result: a 19.3x ROI with just two campaigns in 24 hours.