Culligan vs US Water Systems:Which is more popular?
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 72.6% of all iron filter brand searches we track, and US Water Systems accounted for 1.9%. When we asked ChatGPT and Google AI Overviews about iron filter brands, US Water Systems appeared in three of the five answers and Culligan in none.
Who do people search for more?
Culligan, about 37 searches for every 1 for US Water Systems
Who does AI mention more?
US Water Systems, mentioned in 3 of 5 answers, Culligan in 0
Who does AI recommend more?
US Water Systems, the only one of the two named
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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.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
SpringWell1st
SoftPro2nd
iSpring3rd- US Water Systems4th
Pentair5th- Culligan–
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- SpringWell5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- SoftPro4 of 5Named in 3 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- iSpring3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- US Water Systems3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Pentair1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Culligan0 of 5Named in 0 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about iron filter brands
5 answers
Asked ChatGPT
“Which iron filter brand should I buy?”
Asked ChatGPT
“What are the best iron filter brands?”
Asked ChatGPT
“What's the best iron filter brand for well water treatment?”
Searched Google, AI Overview
“water iron filter”
Searched Google, AI Overview
“well water filter”
Not named in any answer:
Brands are shown in the order each answer named them. The survey took place in the United States on October 21, 2026.
Is Culligan or US Water Systems more popular in search?
This chart shows how often people search Google for Culligan and US Water Systems by name. Each line represents a brand's share of searches for all six iron filter brands we track, month by month, from English-language searches worldwide.
Share of searches by month for Culligan, US Water Systems. The figures are in the table below the chart.
View monthly share of searches table
| Month | Culligan | Pentair | iSpring | US Water Systems | SpringWell | SoftPro |
|---|---|---|---|---|---|---|
| Oct 2025 | 62.3% | 18.7% | 15.3% | 2.5% | 1.1% | 0.1% |
| Nov 2025 | 62.3% | 18.7% | 15.3% | 2.5% | 1.1% | 0.08% |
| Dec 2025 | 62% | 18.6% | 15.2% | 3% | 1.1% | 0.1% |
| Jan 2026 | 68.6% | 16.9% | 11.3% | 2.3% | 0.82% | 0.13% |
| Feb 2026 | 64.2% | 19.3% | 12.9% | 2.6% | 0.93% | 0.1% |
| Mar 2026 | 64.1% | 19.3% | 12.9% | 2.6% | 0.93% | 0.12% |
| Apr 2026 | 64.2% | 19.3% | 12.9% | 2.6% | 0.93% | 0.08% |
| May 2026 | 65.9% | 19.8% | 10.9% | 2.2% | 1.2% | 0.09% |
| Jun 2026 | 64.5% | 19.4% | 13% | 2.1% | 0.93% | 0.08% |
| Jul 2026 | 66% | 19.9% | 10.9% | 2.2% | 0.95% | 0.11% |
| Aug 2026 | 67.1% | 20.2% | 9% | 2.7% | 0.97% | 0.06% |
| Sep 2026 | 72.6% | 14.6% | 9.8% | 1.9% | 1.1% | 0.05% |
How has the Culligan and US Water Systems comparison changed over the last 12 months?
3 findings
- 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 62.3% to 72.6%, 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 2.5% to 1.9%, and its estimated monthly branded searches held steady at 6.6K.
How did search popularity change for iron filter brands worldwide in September 2026?
2 changes
In September 2026, Culligan gained share of searches among iron filter brands worldwide, from 67.1% to 72.6%.
In September 2026, US Water Systems lost share of searches among iron filter brands worldwide, from 2.7% to 1.9%.
How are branded searches counted?
2 search terms
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
1 branded search term
- culligan
US Water Systems
1 branded search term
- us water systems
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