Brandwave

Billi vs Zen Water Systems:Which is more popular?

In September 2026, Billi had more branded searches than Zen Water Systems among water filter brands in Australia. Billi had about 3,600 branded searches, while Zen Water Systems had 590. Billi made up 12.7% of all water filter brand searches we track, and Zen Water Systems accounted for 2.1%. When we asked ChatGPT and Google AI Overviews about water filter brands, neither Billi nor Zen Water Systems appeared in any of the five answers.

Among water filter brands in Australia in September 2026

Who do people search for more?

Billi, about 6 searches for every 1 for Zen Water Systems

Billi 3.6K searchesZen Water Systems 590 searches

Who does AI mention more?

Both were mentioned in 0 of 5 answers.

Billi in 0 of 5Zen Water Systems in 0 of 5

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Top water filter brands in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, neither Billi nor Zen Water Systems showed up in any of the five answers.

Most recommended by AI

Brands get a higher ranking if they are mentioned earlier in the answers.

  1. Puretec1st
  2. Brita2nd
  3. Waterdrop3rd
  4. Doulton–
  5. Zip Water–
  6. Billi–
  7. Zen Water Systems–

Mentioned by AI

Each dot is one answer, filled in when that answer mentions the brand.

  • Brita4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • Waterdrop4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Puretec2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Doulton0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Zip Water0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Billi0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
  • Zen Water Systems0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers

See every answer about water filter brands

5 answers

  • Asked ChatGPT

    “Which water filter should I buy for my home in Australia?”

    1. 1Brita
    2. 2Waterdrop

  • Asked ChatGPT

    “What are the best water filter brands in Australia?”

    1. 1Puretec
    2. 2Brita
    3. 3Waterdrop

  • Asked ChatGPT

    “What's the best filtered water tap for a kitchen?”

    1. 1Puretec
    2. 2Waterdrop

  • Searched Google, AI Overview

    “water filter”

    1. 1Brita
    2. 2Waterdrop

  • Searched Google, AI Overview

    “water filter jug”

    1. 1Brita

Not named in any answer:

Brands are shown in the order each answer named them. The survey took place in Australia on October 26, 2026.

Is Billi or Zen Water Systems more popular in search?

This chart shows how often people search Google for Billi and Zen Water Systems by name. Each line represents a brand's share of searches for all seven water filter brands we track, month by month, from searches in Australia.

Billi and Zen Water Systems among water filter brands in Australia, by month

Share of searches by month for Billi, Zen Water Systems. The figures are in the table below the chart.

View monthly share of searches table
MonthDoultonZip WaterBritaPuretecBilliWaterdropZen Water Systems
Oct 202527.2%22.9%18.2%14.8%12.1%2.4%2.4%
Nov 202532.5%26.4%14.5%11.8%9.7%2.4%2.7%
Dec 202542.9%17.4%15.7%10.4%8.4%2.6%2.6%
Jan 202631%18.8%16.9%16.9%11.3%2.8%2.3%
Feb 202624.8%22.6%16.5%16.5%13.5%3.8%2.2%
Mar 202628%23.5%15.2%15.2%12.5%3%2.5%
Apr 202628.4%22.1%15.4%15.4%12.6%3.5%2.5%
May 202628.7%22.3%15.6%15.6%12.7%3.1%2.1%
Jun 202624.7%23.5%16.4%16.4%13.4%3.3%2.2%
Jul 202632.9%21%14.6%14.6%12%2.9%2%
Aug 202636.9%20.8%13.4%13.4%11%2.7%1.8%
Sep 202628.7%22.3%15.6%15.6%12.7%3.1%2.1%

How has the Billi and Zen Water Systems comparison changed over the last 12 months?

3 findings

How did search popularity change for Australia water filter brands in September 2026?

2 changes

  1. In September 2026, Billi gained share of searches among water filter brands in Australia, from 11% to 12.7%.

  2. Estimated monthly branded searches for Zen Water Systems in Australia fell 18.1% over 12 measured months, from 720 to 590 in September 2026.

How are branded searches counted?

2 search terms

Brandwave collects information about searches that people make online using Billi’s and Zen Water Systems’ names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.

Billi

1 branded search term

  • billi tap

Zen Water Systems

1 branded search term

  • zen water

How the Brand Demand Index is measured

Other head-to-heads among water filter brands

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