--- title: "Culligan vs US Water Systems: Which is searched more?" description: "Is Culligan or US Water Systems more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the Iron filter brands set worldwide. Branded searches tell you how often people look for a brand by name or related terms. Comparing these searches across competitors helps you see how popular each brand is over time." canonical: "https://gobrandwave.com/demand/global-en/compare/culligan-vs-us-water-systems" publisher: "Brandwave" --- # Culligan vs US Water Systems: Which is searched more? Is Culligan or US Water Systems more popular in search? Compare estimated monthly branded-search demand and Share of Search inside the Iron filter brands set worldwide. Branded searches tell you how often people look for a brand by name or related terms. Comparing these searches across competitors helps you see how popular each brand is over time. ## Key facts - **Compared**: Culligan and US Water Systems - **Competitive set**: Iron filter brands - **Market**: Global - **Month measured**: Sep 2026 - **Culligan Share of Search**: 76.4% - **US Water Systems Share of Search**: 2% ## Is Culligan or US Water Systems more popular in search? - In September 2026, Culligan had more branded searches than US Water Systems among iron filter brands worldwide. Culligan had about 246,000 branded searches, while US Water Systems had 6,600. Culligan made up 76.4% of all iron filter brand searches we track, and US Water Systems accounted for 2%. - Culligan was ahead of US Water Systems in every measured month of the 12 months ending September 2026. - Across the 12 months ending September 2026, Culligan’s share of searches among iron filter brands worldwide moved from 68.6% to 76.4%, and its estimated monthly branded searches moved from 165K to 246K. - Across the 12 months ending September 2026, US Water Systems’ share of searches among iron filter brands worldwide moved from 2.7% to 2%, and its estimated monthly branded searches held steady at 6.6K. ## Top iron filter brands in ChatGPT and Google AI Overviews In three ChatGPT questions and two Google AI Overviews, US Water Systems was mentioned in three out of five: in all three ChatGPT answers, but not in either of the two Google AI Overviews. Culligan did not appear in any of the five answers. Brands get a higher AI rank if they are mentioned earlier in the answers that list options. | Brand | AI rank | ChatGPT answers that named it | Google AI Overviews that named it | All answers that named it | | --- | --- | --- | --- | --- | | SpringWell | 1st | 3 of 3 | 2 of 2 | 5 of 5 | | SoftPro | 2nd | 3 of 3 | 1 of 2 | 4 of 5 | | iSpring | 3rd | 2 of 3 | 1 of 2 | 3 of 5 | | US Water Systems | 4th | 3 of 3 | 0 of 2 | 3 of 5 | | Pentair | 5th | 1 of 3 | 0 of 2 | 1 of 5 | | Culligan | Not ranked | 0 of 3 | 0 of 2 | 0 of 5 | ## Every AI answer about iron filter brands - Asked ChatGPT "Which iron filter brand should I buy?": 1. SpringWell, 2. SoftPro, 3. US Water Systems, 4. iSpring - Asked ChatGPT "What are the best iron filter brands?": 1. SpringWell, 2. SoftPro, 3. iSpring, 4. US Water Systems, 5. Pentair - Asked ChatGPT "What's the best iron filter brand for well water treatment?": 1. SpringWell, 2. US Water Systems, 3. SoftPro - Searched Google, AI Overview "water iron filter": 1. SoftPro, 2. SpringWell - Searched Google, AI Overview "well water filter": 1. iSpring, 2. SpringWell Not named in any answer: Culligan. Brands are listed in the order each answer named them. The answers were collected in the United States on October 21, 2026. ## How did search popularity change for iron filter brands worldwide in September 2026? - In September 2026, Culligan gained share of searches among iron filter brands worldwide, from 69.6% to 76.4%. - In September 2026, US Water Systems lost share of searches among iron filter brands worldwide, from 2.8% to 2%. ## Month by month | Month | Culligan estimated searches | Culligan Share of Search | Culligan rank | US Water Systems estimated searches | US Water Systems Share of Search | US Water Systems rank | | --- | --- | --- | --- | --- | --- | --- | | Oct 2025 | 165K | 68.6% | 1 | 6.6K | 2.7% | 4 | | Nov 2025 | 165K | 68.6% | 1 | 6.6K | 2.7% | 4 | | Dec 2025 | 135K | 67.2% | 1 | 6.6K | 3.3% | 4 | | Jan 2026 | 201K | 71.9% | 1 | 6.6K | 2.4% | 4 | | Feb 2026 | 165K | 68.8% | 1 | 6.6K | 2.8% | 4 | | Mar 2026 | 201K | 68.7% | 1 | 8.1K | 2.8% | 4 | | Apr 2026 | 201K | 68.7% | 1 | 8.1K | 2.8% | 4 | | May 2026 | 201K | 68.9% | 1 | 6.6K | 2.3% | 4 | | Jun 2026 | 201K | 69.9% | 1 | 6.6K | 2.3% | 4 | | Jul 2026 | 201K | 69.9% | 1 | 6.6K | 2.3% | 4 | | Aug 2026 | 201K | 69.6% | 1 | 8.1K | 2.8% | 4 | | Sep 2026 | 246K | 76.4% | 1 | 6.6K | 2% | 4 | ## How each brand is measured Brandwave collects information about searches that people make online using Culligan’s and US 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. - **Culligan**: Measured on the search term “culligan”. - **US Water Systems**: Measured on the search term “us water systems”. - [Culligan profile](/demand/global-en/brands/culligan) - [US Water Systems profile](/demand/global-en/brands/us-water-systems) - [All iron filter brands worldwide](/demand/global-en/categories/iron-filter-brands): The set both shares are measured inside, 6 brands. ## Methodology - [How is the Brand Demand Index measured?](/demand/methodology): Where the figures come from, what they compare, and how they may be reused. ## Frequently asked questions ### Is Culligan or US Water Systems more popular in search? In September 2026, Culligan had more branded searches than US Water Systems among iron filter brands worldwide. Culligan had about 246,000 branded searches, while US Water Systems had 6,600. Culligan made up 76.4% of all iron filter brand searches we track, and US Water Systems accounted for 2%. ## Cite this page Brandwave. "Culligan vs US Water Systems: Which is searched more?". https://gobrandwave.com/demand/global-en/compare/culligan-vs-us-water-systems This page is also available as HTML at https://gobrandwave.com/demand/global-en/compare/culligan-vs-us-water-systems. Brandwave publishes an index of its Markdown pages at https://gobrandwave.com/llms.txt.